Capsicums reduce anxiety levels, hypertension, and bloating and also help cure iron deficiencies. Capsicums increase your metabolic rate, so if you are on a diet this vegetable is the way to go. Green capsicums are the least mature when picked and taste slightly bitter. Orange and yellow are a little more mature and have a slightly fruity taste. Red capsicums are the most mature and contain almost 11 times the beta carotene than green ones do.