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Hello, and welcome back to Everyday Science.
Healthy eating crazes usually come and go, but the current focus on cutting out ultra-processed food (UPF) seems to have sticking power.
The UPF theory is that the chief determinant of a healthy diet is whether you mainly make meals from scratch or whether you buy in pre-prepared food like ready meals, soups, sauces, cereals, biscuits and so on.
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