If you are overweight or obese, your doctor will probably recommend that you "go on a diet". Here are some words and phrases that we use to talk about dieting, body size and putting on weight.
watch what you eat = be careful about what you eat, and the quantities you eat
watch your figure = refuse certain food because you want to stay slim
go on a crash diet = start a radical diet to lose weight quickly
count the calories / a calorie-controlled diet = a diet where you measure the calories of each item of food you eat
snack between meals = to eat between meals (avoid doing this if you are on a diet!)
cut out certain foods altogether (i.e. stop eating bread or pasta, for example)
cut down on = reduce the amount of (fatty or sugary foods, for example)
