Would it be possible to live healthily on only a few types of food?

Asked by: Anonymous

Yes, but it gets harder the fewer foods you allow. To stay healthy you need carbohydrates, fats and proteins – and not just any proteins, but a mix containing all 22 amino acids from which your own proteins are built. You need trace elements, vitamins and minerals as well. Avocados reputedly include all these, but not in the right proportions, so you’d need to choose additional foods carefully.

Subscribe to BBC Focus magazine for fascinating new Q&As every month and follow @sciencefocusQA on Twitter for your daily dose of fun science facts.