<human>:  What is the healthiest way to eat food without gaining weight?
<bot>: The healthiest way to eat food without gaining weight is to focus on whole, unprocessed foods that are high in fiber and low in fat and sugar. Try to include plenty of fruits and vegetables, lean proteins, legumes and whole grains in your diet. Monitor your portion sizes and practice mindful eating and be sure to stay sufficiently hydrated. Also, make sure to incorporate physical activity into your daily routine to help keep your weight in check.