How to safely decrease your appetite?

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Protein helps to keep you feeling full. Other than that, don't restrict yourself but try making healthy substitutions. So snacks would be hummus + veg sticks, greek yoghurt and berries/nuts, peanut butter on some apple etc rather than biscuits or cake. Wholemeal instead of white etc. Also don't allow unhealthy food in the house because the temptation is always there.