Put a rubber band round your water bottle for each refill you want to get through today, and slide one off each time you finish it. Nothing to remember, nothing to buy, and you can see where you are at a glance.

Here is a question that costs nothing: has anyone in your family been told their vitamin D was low? It runs in families through genes, skin tone, where you live and how much time anyone spends outside.

Even where a herb has good evidence behind it, that evidence belongs to the plant and not to the bottle in your hand. Testing keeps turning up products that do not contain what the label says.

Where ADHD and disordered eating meet, the pattern is more often bingeing, or bingeing and purging, than strict restriction. Restriction tends to travel with over-control, while bingeing travels with impulse and reward seeking.