I managed to avoid it by not being really tight or going below about 1500 calories a day - so I could eat from all food groups.

I'm not sure there's any real consensus on whether its certain nutrients that cause hairloss - protein is widely believed but low iron can also cause hairloss. Then there's biotin and zinc - personally if you're worried I'd take a specific hair, skin and nails supplement and try not to lose too fast or too drastically.

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Jacqui