Peanuts were domesticated in South America thousands of years ago before Spanish and Portuguese traders spread them globally during the colonial era — remarkably, peanuts reached Africa and Asia and became deeply integrated into those cuisines before returning to prominence in North America. Despite their name, peanuts are technically legumes, not tree nuts.
Peanut's modern research profile has focused substantially on cardiovascular health, given its widespread, affordable consumption and genuine relevance to global heart disease prevention efforts.
Peanut has real, replicated evidence for cardiovascular benefit. A large meta-analysis of prospective cohort studies found peanut consumption was associated with lower incidence of, and mortality from, cardiovascular disease, stroke, and coronary heart disease. A separate meta-analysis of randomized controlled trials found peanut consumption significantly decreased triglycerides and improved cholesterol ratios compared to control groups.
An honest, specific nuance worth knowing: the same meta-analysis found individuals at high cardiometabolic risk experienced a modest increase in body weight after peanut interventions, with weight increasing slightly at higher doses — though not extending to body fat percentage specifically. Given real meta-analysis-level evidence from both cohort studies and RCTs, with a genuine specific caveat about modest weight gain, "Moderate" is the accurate, nuanced rating.
Eaten roasted, boiled, or raw; ground into peanut butter; pressed into oil.