Avocado

A 100-gram serving of avocado delivers about 7 grams of fiber, 3 grams of protein, and 160 calories, along with potassium — roughly 14% of the daily value, more than bananas' 10%. Its fat content triggers cholecystokinin (CCK) release, a satiety signal that works through a different pathway than GLP-1 medications, helping extend fullness without spiking blood sugar. Avocado also helps the body absorb fat-soluble vitamins from foods like salmon and eggs. At around $0.75 to $1.50 each, it's an accessible source of magnesium, folate, vitamins K, E, B6, and copper.