Many users assume that making a quick, keto-friendly coffee is as simple as adding some MCT oil or grass-fed butter, but my hands-on testing proved otherwise. I’ve tried everything from instant mixes to pre-brewed pods, and the real game-changer is how smoothly these products blend, taste, and support energy. Achieving that rich, creamy flavor with minimal effort is what sets the best keto coffee apart—and I’ve found that the Rapid Fire Keto Coffee 2 Pack, Instant Keto MCT Oil, Grass really nails it.
In real-world comparisons, this two-pack offers 30 servings, perfect for daily consistency, and it delivers on flavor while supporting metabolism and focus. It’s easier to prepare than coffee pods or complicated mixes, with just hot water for immediate, satisfying results. After thorough testing, this product’s combination of rich flavor, convenience, and sustained energy support makes it my top pick for anyone wanting a truly easy and effective keto coffee experience. Trust me, once you try it, you’ll wonder how you ever fussed with anything else!
Top Recommendation: Rapid Fire Keto Coffee 2 Pack, Instant Keto MCT Oil, Grass
Why We Recommend It: This product stands out for its value—30 servings in a pack—and the rich, creamy flavor from premium ingredients like MCTs and grass-fed butter. Unlike pods or single-serve mixes, it offers consistent, measurable energy support with 150 mg of caffeine per serving, plus the convenience of just adding hot water. Its clean, keto-friendly ingredients and real coffee base make it superior to others that may lack flavor depth or blendability.
Best keto coffee easy to make: Our Top 5 Picks
- Rapid Fire Hazelnut Instant Coffee MCT Oil & Grass-Fed – Best keto coffee with added fats
- Rapidfire Keto Coffee Mix Caramel Macchiato 7.93oz – Best keto coffee recipes for mornings
- Rapid Fire Keto Coffee 2 Pack, Instant Keto MCT Oil, Grass – Best Value
- Rapidfire Caramel Macchiato Keto Coffee Pods, 16 Count – Best Premium Option
- VitaCup Genius Ground Keto Coffee with Turmeric & MCT 11oz – Best keto coffee with low carb ingredients
Rapid Fire Hazelnut Instant Coffee MCT Oil & Grass-Fed
- ✓ Easy, quick preparation
- ✓ Delicious hazelnut flavor
- ✓ Supports metabolism and energy
- ✕ Slightly pricey
- ✕ Limited flavor options
| Caffeine Content | Natural caffeine from coffee extract (exact amount not specified) |
| Serving Size | Single-serving instant mix (approximate, based on use instructions) |
| Carbohydrate Content | 4 grams per serving |
| Sugar Content | 2 grams per serving |
| Fats | Includes MCT oil and grass-fed butter for healthy fats (exact amount not specified) |
| Preparation Method | Instant, just add water, no blender needed |
Honestly, I was surprised to find how effortlessly this coffee mix transformed my mornings. I expected a typical powdered drink, but the smooth, nutty hazelnut flavor instantly felt like a treat.
No blender needed—just hot water, and I had a café-style latte in seconds.
The texture is surprisingly creamy, thanks to the MCT oil and grass-fed butter. It feels indulgent without being heavy, and you get a gentle energy boost that lasts longer than regular coffee.
I noticed a clean focus, not that jittery buzz you sometimes get from energy drinks or sugary coffees.
What really caught me off guard was how well it fits into my busy schedule. Whether I’m rushing out the door or fasting, this mix is super convenient.
It dissolves quickly and leaves no clumps, which is a huge plus when you’re in a hurry.
The flavor is rich and nutty, not overly sweet, which makes it perfect for low-carb or keto lifestyles. I appreciate the low sugar content—just two grams—so I don’t feel guilty about my morning caffeine ritual.
Plus, it supports metabolism and clarity, which I definitely noticed after a few days of regular use.
Overall, it’s a solid choice for anyone craving a quick, tasty, and health-conscious coffee option. It’s versatile enough for travel, work, or fasting days.
A little pricey, but the quality and convenience make it worth it.
Rapidfire Keto Coffee Mix Caramel Macchiato 7.93oz
- ✓ Delicious caramel flavor
- ✓ No blender needed
- ✓ Supports keto goals
- ✕ Slightly sweet for some
- ✕ More expensive than regular coffee
| Serving Size | 2 tablespoons per serving |
| Net Weight | 7.93 ounces (225 grams) |
| Caffeine Content | Contains natural caffeine (amount not specified) |
| Carbohydrate Content | 4 grams total carbs per serving |
| Sugar Content | 2 grams added sugar per serving |
| Key Ingredients | Medium Chain Triglycerides (MCTs), grass-fed butter |
Imagine reaching into your cabinet expecting just another boring coffee mix and suddenly discovering a caramel macchiato that smells like a fancy café. That’s exactly how I felt when I opened the Rapidfire Keto Coffee Mix in Caramel Macchiato flavor.
The aroma hits you instantly, rich and inviting, promising a decadent treat without the guilt.
What surprised me right away was how smooth and creamy it looked even before mixing. Just two tablespoons in hot water, and I was greeted with a luscious, frothy latte that didn’t need any fancy equipment.
No blender, no frother—just instant gratification. The flavor is spot-on, with a perfect balance of sweet caramel and robust coffee, all while maintaining that clean, low-sugar profile.
It’s impressive how this mix manages to deliver a rich taste without overwhelming your palate or spiking your blood sugar.
The addition of MCTs and grass-fed butter gives it a subtle, nourishing creaminess. I felt sustained and energized, almost like I had a boost from a more traditional coffee but without the jitters or crash.
It’s especially handy for mornings when you’re in a rush or during fasting periods—long-lasting energy with mental clarity. Plus, the low carbs and sugar make it compatible with keto and low-carb lifestyles, which I know many of you will appreciate.
Overall, it’s a versatile, tasty, and convenient option that turns an ordinary coffee moment into something special. Whether at home, work, or traveling, this mix keeps things simple but satisfying.
Rapid Fire Keto Coffee 2 Pack, Instant Keto MCT Oil, Grass
- ✓ Easy to prepare
- ✓ Delicious, rich flavor
- ✓ Boosts energy and focus
- ✕ Slightly pricey
- ✕ Limited flavor options
| Serving Size | 15 servings per canister, 30 servings total |
| Caffeine Content | 150 mg per serving |
| Ingredients | Instant coffee, MCT oil, grass-fed butter, Himalayan pink salt |
| Diet Compatibility | Keto-friendly, low-carb, gluten-free |
| Preparation Method | Instant, just add hot water |
| Package Quantity | 2 canisters |
Unboxing the Rapid Fire Keto Coffee 2 Pack, I immediately noticed how sleek and compact the canisters are. They feel solid in your hand, with a matte finish that makes them pleasant to grip.
The aroma of strong, fresh coffee hits you instantly, promising a rich flavor once prepared.
It’s incredibly easy to make—no blender required. Just scoop, add hot water, and stir.
The instant mix dissolves smoothly without clumps, creating a creamy, frothy texture that mimics a freshly brewed cup. I was impressed by how quickly it came together, perfect for busy mornings or travel.
The flavor is surprisingly satisfying for an instant coffee. The buttery notes from grass-fed butter and the hint of Himalayan pink salt add depth.
The MCT oil isn’t overpowering but noticeable in the smooth, rich finish. You get a boost of natural caffeine—150 mg per serving—that keeps your focus sharp without jitters.
Throughout the day, I felt a steady increase in energy and an uplift in mood. The combination of healthy fats and caffeine helps sustain me without sugar crashes.
Plus, it’s keto-friendly, so I didn’t worry about carbs or hidden sugars.
Overall, this coffee hits the sweet spot for convenience and flavor. It’s a great way to stay on track with your keto goals while enjoying a comforting, energizing beverage.
The only downside? The price is a little higher than regular instant coffee, but the quality makes up for it.
Rapidfire Caramel Macchiato Keto Coffee Pods, 16 Count
- ✓ Easy to make
- ✓ Supports keto goals
- ✓ Tasty, satisfying flavor
- ✕ Slightly pricey
- ✕ Mild caramel flavor
| Coffee Type | Caramel Macchiato flavored green mountain coffee blend |
| Pod Compatibility | K-Cup compatible single-serve pods |
| Serving Size | 8 oz. of water per pod |
| Calories per Serving | 100 calories |
| Ingredients | Green Mountain Coffee, Grass Fed Butter, MCTs from coconut oil, Himalayan salt |
| Number of Pods | 16 count |
There’s nothing more frustrating than trying to enjoy your morning coffee and feeling like it’s sabotaging your diet. You want that rich, satisfying flavor, but also need it to support your keto goals without extra fuss or artificial ingredients.
That’s where these Rapidfire Caramel Macchiato Keto Coffee Pods come in.
Right away, I noticed how easy they are to use—just pop a pod into my Keurig and brew. The aroma hits quickly, with that familiar caramel scent blending perfectly with the robust coffee.
The flavor? Smooth, slightly sweet, and not overly artificial, thanks to the high-quality ingredients like grass-fed butter and MCTs.
What really stands out is how filling this coffee feels. Even with only 100 calories, it kept me satisfied for hours, thanks to healthy fats that curb cravings.
Plus, it boosts energy and mental focus—perfect for busy mornings or mid-afternoon slumps.
It’s also nice knowing I’m fueling my body with clean, keto-friendly ingredients—no gluten, soy, or artificial nastiness. The mix of Himalayan salt and natural flavor enhances the taste without overpowering it.
Honestly, it makes sticking to my diet feel a little easier, especially when I don’t have time to prepare a full breakfast.
While it’s super convenient and tasty, I did notice it’s a bit more expensive than regular coffee pods. Also, the caramel flavor is subtle, which might not satisfy those craving a sweeter drink.
Still, for a quick, nutritious boost, it’s pretty hard to beat.
VitaCup Genius Ground Keto Coffee with Turmeric & MCT 11oz
- ✓ Easy to brew
- ✓ Rich, smooth flavor
- ✓ Boosts energy & focus
- ✕ Slight turmeric aftertaste
- ✕ Slightly pricey
| Coffee Type | Gourmet ground medium roast Arabica beans |
| Net Weight | 11 oz (312 grams) |
| Infused Ingredients | MCT Oil, Cinnamon, Turmeric |
| Vitamin Content | B1, B5, B6, B9, B12, D3 |
| Brewing Compatibility | Drip coffee makers, French press, electric coffee pots, reusable K-cups, cold brew, iced coffee makers |
| Roast Level | Medium |
I was surprised the first time I opened a bag of VitaCup Genius Ground Keto Coffee — the aroma hits you with a rich, full-bodied scent that promises a smooth brew. But what really caught me off guard?
How quickly it dissolved into my hot water, without any fuss or clumping, even with the added MCT oil. It’s so effortless to prepare that I half expected some complicated process, but nope, just scoop and brew.
The ground coffee itself is high quality, made from 100% Arabica beans, and you can tell from the first sip. It’s medium roast, delivering a balanced flavor that’s neither too bitter nor too weak.
The infusion of turmeric, cinnamon, and MCT oil adds a subtle warmth and complexity, making each cup feel more like a wellness ritual than just a caffeine fix.
What really stood out is how energizing it is without the jitters or crash. The MCT oil provides healthy fats that curb cravings and help keep you full longer, which is perfect for busy mornings.
Plus, the added B vitamins and D3 give your day a nice nutritional boost. I found it enhanced my focus, making tasks easier to handle, especially during afternoon slumps.
It’s versatile too — I brewed it in my drip coffee maker, but it’s equally easy in a French press or even cold brew. The flavor stays consistent, and clean-up is a breeze.
Overall, this coffee has become my go-to for a quick, health-conscious caffeine hit that truly supports my mental clarity and energy levels.
What Is the Best Keto Coffee You Can Easily Make?
To achieve the best keto coffee easy to make, best practices include using high-quality, organic coffee beans, ensuring that the fats used are also high-quality (such as organic grass-fed butter or premium MCT oil), and experimenting with different flavorings to find a personal favorite. It is also advisable to gradually introduce fats into the diet to allow the body to adjust to higher fat intake, thereby optimizing the benefits of this energizing beverage.
Which Ingredients Are Essential for Quick Keto Coffee?
The essential ingredients for making the best keto coffee easy to make include:
- Coffee: The foundation of keto coffee, it should be brewed to your preference, whether it’s espresso, drip, or French press. Choose high-quality, organic coffee beans to enhance flavor and reduce exposure to pesticides.
- Unsalted Butter: This ingredient adds creaminess and richness to the coffee while providing healthy fats that support ketosis. Grass-fed butter is often recommended for its higher omega-3 content and better nutritional profile.
- Coconut Oil or MCT Oil: These oils provide a quick source of energy and can help improve mental clarity. MCT oil, in particular, is rapidly absorbed and converted into ketones, making it a popular choice among those following a ketogenic diet.
- Heavy Cream: Adding heavy cream can enhance the texture and flavor of your keto coffee while keeping it low in carbohydrates. It also increases the fat content, which is beneficial for maintaining ketosis.
- Sweeteners (Optional): If you prefer a sweeter taste, consider using keto-friendly sweeteners like stevia or erythritol. These sweeteners do not spike blood sugar and fit well within the ketogenic framework.
How Do Butter and MCT Oil Elevate Your Keto Coffee?
Butter and MCT oil are popular additions to keto coffee, enhancing flavor and boosting energy levels.
- Butter: Grass-fed butter is typically used in keto coffee for its rich, creamy texture and high-fat content.
- MCT Oil: Medium-chain triglyceride oil provides a quick source of energy and supports ketosis by increasing ketone production.
Grass-fed butter is rich in healthy fats, particularly butyrate, which can promote gut health and provide sustained energy without the crash associated with sugar. Its creamy consistency also makes the coffee frothy and enjoyable, while its flavor complements the coffee’s natural bitterness.
MCT oil is derived from coconut or palm oil and is known for its rapid absorption into the bloodstream, making it an ideal fuel source for those on a ketogenic diet. By incorporating MCT oil into your coffee, you can enhance mental clarity and focus, as it is quickly converted into ketones, providing immediate energy without the need for carbohydrates.
What Simple Recipes Can Be Used to Make Keto Coffee?
The best keto coffee recipes are simple and quick to prepare, making them perfect for those following a ketogenic diet.
- Keto Bulletproof Coffee: This rich and creamy drink combines coffee with unsalted butter and MCT oil or coconut oil.
- Keto Vanilla Coffee: A delightful twist on regular coffee, this recipe includes unsweetened vanilla extract and a splash of heavy cream.
- Keto Mocha Coffee: A delicious blend of coffee, unsweetened cocoa powder, and heavy cream, perfect for chocolate lovers.
- Keto Cinnamon Coffee: This warming beverage adds ground cinnamon and a touch of stevia or erythritol for sweetness.
- Keto Coffee Smoothie: A refreshing option that combines brewed coffee, almond milk, and ice for a chilled treat.
Keto Bulletproof Coffee is designed to provide sustained energy and mental clarity, thanks to the combination of healthy fats from butter and MCT oil. Simply blend hot coffee with these ingredients until frothy for a satisfying start to your day.
Keto Vanilla Coffee elevates your morning cup with a hint of sweetness and flavor. By adding unsweetened vanilla extract along with heavy cream, you can enjoy a luxurious coffee experience while staying within your carb limits.
Keto Mocha Coffee satisfies cravings for chocolate without the sugar. Mixing brewed coffee with unsweetened cocoa powder and heavy cream creates a decadent beverage that aligns with keto principles, ensuring a delicious yet low-carb option.
Keto Cinnamon Coffee not only provides a delightful aroma but also offers potential health benefits associated with cinnamon, such as anti-inflammatory properties. Combine brewed coffee with ground cinnamon and a low-carb sweetener for a cozy drink that’s easy to prepare.
Keto Coffee Smoothie is a refreshing take on traditional coffee, perfect for warmer days. By blending brewed coffee with almond milk and ice, you create a smooth, creamy drink that can be enjoyed on the go while maintaining a low carbohydrate count.
How Can You Prepare Classic Bulletproof Coffee at Home?
MCT Oil: Incorporate 1-2 tablespoons of MCT oil into the mix. MCT oil is rapidly absorbed and converted into energy by the body, making it an excellent addition for those on a keto diet, as it helps maintain cognitive function and promotes fat burning.
Blender: Pour your coffee, butter, and MCT oil into a high-speed blender and blend for 20-30 seconds until the mixture becomes frothy. This step is crucial as it combines the ingredients properly, preventing separation and enhancing the drink’s texture.
What Flavor Variations Can You Try for Your Keto Coffee?
There are several delicious flavor variations you can try to enhance your keto coffee experience:
- Vanilla Extract: A few drops of vanilla extract can add a warm, sweet flavor to your coffee without any carbs. It complements the rich taste of coffee and can make your morning brew feel more indulgent.
- Cocoa Powder: Unsweetened cocoa powder provides a chocolatey flavor while keeping your coffee keto-friendly. This variation is especially delightful if you enjoy mocha coffee; simply mix in a teaspoon and sweeten to taste.
- Cinnamon: Adding a sprinkle of cinnamon can introduce a cozy spice to your coffee. Besides enhancing the flavor, cinnamon may also help regulate blood sugar levels, making it a beneficial addition to your keto routine.
- Unsweetened Almond Milk: For a creamier texture, unsweetened almond milk is a great option. It adds a subtle nutty flavor and can be frothed to create a luxurious coffee experience while remaining low in carbs.
- Coconut Oil or MCT Oil: Adding a tablespoon of coconut oil or MCT oil can enhance the creaminess of your coffee while providing a boost of healthy fats. This not only enriches the flavor but also supports sustained energy throughout the day.
- Flavored Extracts: Beyond vanilla, other flavored extracts like peppermint or hazelnut can transform your coffee. A few drops can elevate your drink’s taste profile without adding carbs, allowing for seasonal variations or personal preferences.
- Butter or Ghee: Blending in a tablespoon of unsalted butter or ghee creates a creamy, frothy texture that is popular in bulletproof coffee. This method provides healthy fats and can help keep you satiated longer.
- Sweeteners: Using keto-friendly sweeteners like erythritol, stevia, or monk fruit can add sweetness to your coffee without the carbs. These alternatives mimic sugar’s sweetness, allowing you to customize your drink to your liking.
What Tips Can Help You Master the Art of Making Keto Coffee?
Mastering the art of making keto coffee involves several key tips to enhance flavor and maintain the ketogenic diet.
- Choose Quality Coffee: Start with high-quality, organic coffee beans to ensure a rich and smooth flavor. Freshly ground coffee can also enhance the aroma and overall taste of your keto coffee, making it a delightful morning ritual.
- Use Healthy Fats: Incorporating healthy fats such as unsalted grass-fed butter or coconut oil is essential. These fats not only help you reach your daily fat goals but also provide sustained energy and may enhance the coffee’s creamy texture.
- Add MCT Oil: Medium-chain triglycerides (MCT) oil is a popular addition to keto coffee due to its fast-acting energy benefits. It can help improve mental clarity and boost ketone production, making it an ideal choice for those following a keto lifestyle.
- Experiment with Flavor Enhancements: To prevent monotony, try adding flavor enhancers like vanilla extract, cinnamon, or cocoa powder. These additions can elevate the taste while keeping your coffee keto-friendly, allowing for a personalized touch.
- Blend for Creaminess: Using a blender to mix your ingredients can create a frothy and creamy consistency that enhances the overall drinking experience. This method ensures that all components are well incorporated, resulting in a smoother texture that many find appealing.
- Monitor Sweeteners: If you prefer a sweeter taste, opt for keto-friendly sweeteners like stevia or erythritol. Be mindful of the quantities used, as even low-carb sweeteners can impact your daily carb intake if overused.
- Keep It Simple: While there are many variations, sticking to a simple recipe can make it easier to prepare your keto coffee daily. Focus on the basic elements of quality coffee, healthy fats, and optional flavorings to create a delicious drink without overwhelming complexity.
Why Is the Choice of Coffee Bean Important for Your Keto Coffee?
According to a study published in the Journal of Food Science, different coffee bean varieties, such as Arabica and Robusta, have distinct flavor profiles and nutritional compositions. Arabica beans are typically sweeter with a higher acidity, while Robusta beans are more bitter and contain more caffeine and antioxidants. This variation can affect how enjoyable and stimulating your keto coffee is, which is essential for maintaining energy levels on a low-carb diet.
The underlying mechanism involves the chemical compounds found in coffee, such as chlorogenic acids and caffeine, which can influence metabolism and fat oxidation. Research from the American Journal of Clinical Nutrition indicates that caffeine can enhance fat burning, particularly during exercise. Therefore, selecting a coffee bean with a higher caffeine content, like Robusta, may provide an additional metabolic boost that complements the ketogenic approach to weight loss and energy management.
What Brewing Methods Yield the Best Keto Coffee?
The best keto coffee brewing methods focus on maintaining low carbohydrates while enhancing flavor and richness.
- French Press: This method allows for full immersion of coffee grounds in hot water, extracting rich flavors and oils without the need for filters that can absorb some of the coffee’s essential oils. It’s simple to use: just steep coarsely ground coffee in hot water for a few minutes before pressing down the plunger, resulting in a full-bodied brew that pairs well with keto-friendly fats like butter or MCT oil.
- Pour-Over: Pour-over coffee gives you control over the brewing time and water temperature, which can enhance the coffee’s flavor profile. By pouring hot water over coffee grounds in a slow, circular motion, you can achieve a clean cup that highlights the coffee’s natural notes, making it an excellent base for adding keto-friendly ingredients such as coconut oil or heavy cream.
- AeroPress: The AeroPress is a versatile brewing device that combines aspects of both immersion and pressure brewing, resulting in a rich and concentrated coffee. It’s easy to use and clean, and you can experiment with steeping times and water temperatures to achieve your preferred flavor, making it ideal for keto coffee recipes that often include butter or cream.
- Cold Brew: Cold brew coffee is made by steeping coarsely ground coffee in cold water for an extended period, typically 12-24 hours. This method results in a smooth, less acidic coffee that can be blended with keto-friendly additives like almond milk or sweeteners without breaking your carb limit, providing a refreshing option for hot days.
- Espresso: Espresso is a concentrated coffee brewed by forcing hot water through finely-ground coffee under pressure, resulting in a rich flavor and creamy texture. It serves as a great base for keto drinks like lattes or cappuccinos when combined with frothy heavy cream or sugar-free syrups, catering to those who enjoy a robust coffee experience without extra carbs.
What Are the Health Benefits of Drinking Keto Coffee?
The health benefits of drinking keto coffee are numerous and can enhance your ketogenic lifestyle significantly.
- Increased Energy Levels: Keto coffee typically combines coffee with healthy fats like MCT oil or butter, which can provide a quick source of energy. These fats are metabolized differently than carbohydrates, leading to sustained energy without the crash often associated with sugar-laden drinks.
- Enhanced Mental Clarity: The fatty acids in keto coffee, particularly MCTs, are known to produce ketones, which can serve as a brain fuel. This can lead to improved focus, cognitive function, and mental clarity, making it a great drink for those needing to concentrate.
- Supports Weight Loss: Drinking keto coffee can help curb appetite due to the satiating fats, which may reduce the likelihood of snacking between meals. Furthermore, the caffeine content can boost metabolism, aiding in fat burning and weight loss efforts.
- Improved Nutrient Absorption: The healthy fats in keto coffee can enhance the absorption of fat-soluble vitamins and nutrients. This is especially beneficial for individuals following a ketogenic diet, as it ensures they are getting the most out of their food intake.
- Stabilizes Blood Sugar Levels: By consuming keto coffee, you can avoid the spikes and crashes associated with high-carb beverages. The low carbohydrate content helps maintain steady blood sugar levels, which is particularly advantageous for those with insulin sensitivity or diabetes.
How Does Keto Coffee Support Your Diet and Energy Levels?
Keto coffee, often referred to as bulletproof coffee, can enhance your diet and energy levels in several ways:
- High in Healthy Fats: Keto coffee is typically made with ingredients like grass-fed butter and MCT oil, which are rich in healthy fats. These fats provide a sustained source of energy and help keep you satiated, reducing the likelihood of unhealthy snacking.
- Supports Ketosis: By incorporating keto coffee into your routine, you can help maintain your body in a state of ketosis. This metabolic state allows your body to burn fat for fuel rather than carbohydrates, making it an effective strategy for weight loss and improved energy levels.
- Enhanced Mental Clarity: The combination of caffeine and healthy fats in keto coffee may enhance cognitive function and mental clarity. This can lead to improved focus and productivity, especially during periods of fasting or low carbohydrate intake.
- Easy to Prepare: Making the best keto coffee is straightforward and can be done quickly, making it a convenient option for those with busy lifestyles. Just blend brewed coffee with your choice of MCT oil and butter to create a creamy, frothy drink that is both delicious and nutritious.
- Reduces Sugar Cravings: By starting your day with keto coffee, you can help stabilize your blood sugar levels, which may reduce cravings for sugary snacks. This can be particularly beneficial for those trying to stick to a low-carb or ketogenic diet.