However, peanuts are calorie-dense, so eating large amounts regularly can contribute to weight gain. Overeating them may also cause bloating, gas, or constipation, while heavily salted varieties can add excessive sodium.
Peanut allergies can be serious and may cause hives, swelling, breathing problems, or potentially life-threatening anaphylaxis. Poorly stored peanuts can also develop aflatoxins from mold, so peanuts that smell musty, taste bitter, or look discolored should be discarded.
For most people, a small handful—about 28–30 grams—is a reasonable serving. Choose fresh, unsalted or dry-roasted peanuts, store them in a cool and dry place, and enjoy them as part of a balanced diet.
