PROS: F.A.S.T actually stands for ‘Families Always Stick Together’, which means the diet is based on the idea that people do better when they have the right support. If more than one person in your family wants to lose weight this could be the right approach.

CONS: Finding the right balance of low-calorie, high-fibre foods can be tricky to begin with. The diet is based around accountability, so you may find it difficult if you’re trying it on your own.

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