Diet, sleep, stress reduction and exercise are the best ways to get a flatter stomach. Reducing the overall body fat naturally leads to a reduction in fat around the abdomen.
Eating healthier and exercising reduces the overall body fat. Strength training burns more calories and helps tone the abs for a flatter looking tummy. Reducing stress prevents visceral fat storage in the midsection. A study from 1994 shows a connection between stress-induced cortisol secretion and abdominal fat storage in women. People getting six to seven hours of sleep gained less visceral fat that those who slept more than eight hours a night and those who slept less than five hours a night.