Green bell peppers are one of the most nutrient-dense low-calorie vegetables you can eat. A single cup has just 30 calories and delivers nearly a full day’s worth of vitamin C, along with fiber, eye-protecting plant pigments, and a range of antioxidants. They’re also one of the most affordable bell peppers at the grocery store, since they’re harvested before full ripening.
A Vitamin C Powerhouse
Green bell peppers contain about 80 milligrams of vitamin C per 100 grams, which is roughly one medium pepper. The recommended daily intake for adults is 75 to 90 milligrams, so a single pepper gets you there or very close. That puts green peppers in the same league as oranges for vitamin C content, though most people don’t think of them that way.
This vitamin C content has a practical bonus beyond immune support: it significantly improves your body’s ability to absorb iron from plant-based foods. If you eat beans, lentils, spinach, or fortified cereals, pairing them with green pepper (in a stir-fry, salad, or side dish) helps your body pull more iron from those foods. This matters especially for people prone to iron deficiency, including those on vegetarian or vegan diets.
Low-Calorie, High-Fiber Fuel
One cup of chopped green bell pepper contains about 7 grams of carbohydrate and almost 3 grams of fiber. That ratio makes green peppers a smart choice if you’re watching your blood sugar. The fiber slows digestion, which prevents the sharp blood sugar spikes that come from eating refined carbohydrates. The American Diabetes Association specifically highlights bell peppers as a good seasonal vegetable choice for people managing diabetes.
At 30 calories per cup, green peppers also give you a lot of volume and crunch for very little caloric cost. You can stuff them, slice them into strips for snacking, or dice them into grain bowls without meaningfully changing the calorie count of your meal.
Eye-Protective Pigments
Green bell peppers contain lutein and zeaxanthin, two plant pigments that accumulate in the retina and help protect it from light damage. Together with a related compound called meso-zeaxanthin, these pigments make up the macular pigment that shields the center of your vision. Your body cannot produce them on its own, so they must come from food.
A daily intake of about 10 milligrams of lutein and 2 milligrams of zeaxanthin has been linked to slower progression of age-related macular degeneration, the leading cause of vision loss in older adults. Green peppers contribute to this intake, though orange bell peppers are the real standouts for zeaxanthin specifically. Still, regularly eating green peppers as part of a varied diet adds meaningfully to your eye health over time.
Antioxidants Beyond Vitamins
Green peppers contain a variety of phenolic compounds and flavonoids that act as antioxidants in the body. Researchers have identified at least nine distinct phenolic compounds in sweet peppers, including coumaric acid, chlorogenic acid, caffeic acid, and quercetin-related flavonoids. These compounds help neutralize oxidative stress, which is the kind of cellular damage linked to chronic inflammation, heart disease, and cancer.
Green peppers also provide smaller amounts of vitamins B6, K, A, and E, plus minerals. While no single food prevents disease on its own, the combination of vitamin C, fiber, carotenoids, and phenolic compounds in green peppers makes them more than just a crunchy filler in your meals.
How Green Peppers Compare to Red
Green bell peppers are simply unripe versions of red, yellow, or orange peppers. Because they’re picked earlier, they have a slightly more bitter, grassy flavor and a firmer texture. Nutritionally, red peppers are the most nutrient-dense of the bunch. They contain more vitamin C, more vitamin A, and additional antioxidants like lycopene and capsanthin that develop during ripening.
That said, green peppers hold their own. They’re the primary bell pepper variety that provides lutein and zeaxanthin, which diminish as peppers ripen into red. They’re also consistently cheaper (sometimes half the price of red peppers), which makes them easier to eat in larger quantities and more often. If your budget allows for a mix, rotating colors gives you the broadest range of nutrients. If green is what you buy most, you’re still getting excellent nutritional value.
Best Ways to Eat Them
Raw green peppers retain the most vitamin C. Boiling them for 10 minutes reduces vitamin C content by about 25 percent, so if you’re cooking them, shorter is better for preserving nutrients. Quick sautéing, roasting at high heat for a short time, or adding them raw to salads and sandwiches are all good strategies. Interestingly, extended boiling (20 to 30 minutes) can actually concentrate the remaining vitamin C as water evaporates from the pepper, though you’ll still lose some compared to eating it raw.
For maximum iron absorption benefits, eat green pepper alongside iron-rich foods in the same meal. Toss diced raw pepper into a bean salad, add strips to a lentil wrap, or include them in a tofu stir-fry.
Storing Green Peppers
Green bell peppers last longest when stored at about 7.5°C (45°F), which is slightly warmer than most home refrigerators. At that temperature, they can keep for 3 to 5 weeks. In a typical home fridge set closer to 5°C (41°F), they’ll stay fresh for about 2 weeks before chilling injury starts to appear, showing up as soft spots or discoloration. Storing peppers above 7.5°C causes faster water loss and shriveling, so leaving them on the counter shortens their usable life considerably.
If your fridge has a crisper drawer with humidity control, that’s the best spot. Keep them unwashed until you’re ready to use them, since moisture on the surface speeds up spoilage.