Could a daily pill reduce your risk of heart disease, cancer and Alzheimer’s disease, slow the ageing process and even help you lose weight? According to some supplement ­manufacturers, a pill made from ­resveratrol — the plant chemical that gives red wine its colour — can, indeed, do all these things. Certainly the latest scientific breakthrough seems to suggest the ‘red wine’ pill does have some of these ­benefits — it’s been found to protect against Alzheimer’s when taken daily with ­metformin, a diabetes drug.