Peppers are one of the most keto-friendly vegetables you can eat. A whole medium bell pepper contains roughly 5 to 7 grams of total carbs, and hot peppers come in even lower. Whether you’re snacking on raw bell pepper strips, cooking with jalapeños, or seasoning with black pepper, you can fit all of them into a standard ketogenic diet with room to spare.
Bell Pepper Carbs by Color
All bell peppers start out green and ripen into red, yellow, or orange. As they ripen, their sugar content increases, which means the color you choose does affect your carb count, though not dramatically.
Green bell peppers are the lowest in sugar. One cup of chopped raw green pepper (about 149 grams) has 6.9 grams of total carbs and 3.6 grams of sugar. A medium red bell pepper (119 grams) has 7.2 grams of total carbs and 5 grams of sugar. Yellow peppers land on the higher end, with a large yellow pepper (186 grams) containing around 11.8 grams of total carbs.
For net carbs, subtract the fiber. A 100-gram serving of raw red bell pepper provides about 6 grams of carbs and 2.1 grams of fiber, leaving roughly 4 grams of net carbs. That’s a small fraction of the typical 20 to 50 grams of daily net carbs most keto dieters aim for. Green peppers will net slightly less per serving since they carry less sugar.
Bell peppers are also 92% water and only 26 calories per 100 grams, making them a high-volume food that adds bulk to meals without much metabolic cost. Their estimated glycemic index is low because they contain virtually no starch.
Hot Peppers Are Even Lower in Carbs
If you like heat, you’re in luck. Hot peppers are smaller and more intensely flavored, so you use far less of them, and they’re naturally low in carbohydrates even by weight. Four whole habanero peppers (about 28 grams) contain just 2 grams of total carbs and 1 gram of net carbs after fiber. Jalapeños and serranos fall in a similar range.
Beyond their low carb count, hot peppers contain capsaicin, the compound responsible for the burning sensation. Capsaicin acts as a thermogenic chemical, meaning it generates heat in the body and may give your metabolism a modest boost. The Cleveland Clinic notes that research suggests capsaicin can stimulate fat burning, which aligns well with the goals of a ketogenic diet. The effect is relatively small, but it’s a nice bonus on top of the flavor.
Black Pepper and Other Dried Spices
Ground black pepper, the kind sitting on your dinner table, contains about 1.4 grams of total carbs per teaspoon with 0.6 grams of fiber. That leaves under 1 gram of net carbs per teaspoon. Since most people use a fraction of a teaspoon per dish, black pepper is essentially carb-free in practical terms. The same applies to cayenne, paprika, chili flakes, and other dried pepper-based seasonings. Season freely.
Watch for Hidden Carbs in Packaged Peppers
Fresh peppers are straightforward, but jarred and packaged products sometimes add sugar or starchy fillers. The good news is that many commercially roasted red peppers are clean. A typical jarred roasted red pepper lists just peppers, water, sea salt, and citric acid, with zero added sugars. Still, it’s worth checking labels. Some brands, particularly those marketed as “sweet” or used in pepper relishes and spreads, may include sugar or high-fructose corn syrup. A quick glance at the ingredient list is all it takes.
Using Peppers in Keto Meals
Stuffed peppers are one of the most popular ways to use bell peppers on keto, and the swap is simple: replace the rice with cauliflower rice. Cauliflower rice provides a similar texture with a fraction of the carbohydrates of white rice. A stuffed pepper made with cauliflower rice, ground meat, and cheese comes in around 17 grams of total carbs and 4 grams of fiber per serving, or about 13 grams of net carbs for a full, satisfying meal. If you use frozen cauliflower rice, thaw it first to prevent the filling from getting soggy.
Raw bell pepper strips work well as a crunchy vehicle for high-fat dips like guacamole or cream cheese-based spreads. Sliced jalapeños add punch to fathead pizza, omelets, and burger bowls. Roasted bell peppers blend into creamy sauces that pair with grilled chicken or steak. None of these uses will put a meaningful dent in your daily carb budget.
If you’re trying to minimize carbs as much as possible, lean toward green bell peppers and hot varieties. If you prefer the sweeter flavor of red or yellow peppers, you can still enjoy them freely. Even a whole large yellow bell pepper, the highest-carb option, stays well under 12 grams of total carbs. For most people following a ketogenic diet, that leaves plenty of room for the rest of the day.