Find a rhythm in the way you eat and drink. Never starve yourself! Compare the body to an engine. If you run out of fuel, you need to recharge, regain what you need.
If you want to work on your figure, the way your eat is essential. Most of the times you don't need to follow a strict diet, but you need a good balance in what you eat. Doing the workout is not enough, you need regular meals. Have good healthy snacks between the meals at 10 am and 4 pm. If you get hungry during the day, it's essential that you take a snack.
Eating some chips once a week is not a problem. If 90% of your diet is in balance, it's a good result.
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Extract from a short interview with Haaije Pijl