If you want bigger biceps like cartoon character Popeye, eat spinach, which contains phytoecdysteroids. The leafy green vegetable boosts strength and increases the development of muscles, according to researchers at Rutgers University in New Jersey.
Extracts of phytoecdysteroids used on laboratory samples of human muscle speeded up growth by 20 percent, and injections in rats made them stronger in a month. As well as being rich in vitamins, spinach helps prevent eye disease, teeth problems, gum disease and anemia. It is also used in the fight against cancer and as a detox food.