Image copyrightGETTY IMAGES

Young people are being warned that faddy diets are putting their health at risk.

The National Osteoporosis Society found that a fifth of under-25s were cutting out or reducing dairy in their diet, which can affect their bones.

One diet that – in its extreme form – recommends avoiding dairy is “clean eating”.

What is clean eating?

The idea is to only eat “clean” foods by cooking from scratch, choosing foods in their natural state, and eliminating refined sugar.

More extreme versions might exclude gluten, grains, dairy – or even encourage a raw food diet.

What’s on the menu?

Pippa Selby, a clean eater for three years, starts the day with a bowl of smoothie, frozen fruit, fresh fruit, oats and a nut butter.

Image copyrightPIPPA SELBY

Lunch might be a homemade soup or a mozzarella salad. For dinner a…