"going on a diet" mean being moderate in eating and drinking。
a we know， our body i a balanced ytem which need a reaonable diet。 a reaonable or balanced diet can help people keep fit becaue it not only prevent them from eating too much fat which may caue many dieae but aic provide them with ufficient nutrition to guarantee that their body operate properly。 beide， going on a diet can aic help people， epecially young ladie keep a lender figure， which will of coure beautify their life。however， every coin ha two ide。 going on a diet i no exception。 if carried to extreme， going on a diet may even become dangerou to our health。 a we know， eating too much will reult in corpulence， while eating too little wili lead to malnutrition， which i alo the caue of many dieae， obviouly， going on a diet doen't mean eating too little， uch a miundertanding mut be avoided。
in my judgement， not everybody need to go on a diet。 good health hould be our primary concern。 if your purpoe i to have a lender figure， a diet hould be carried only to the extent that your health i not affected。