Sleep

Symptoms

• Frequent urination at night (nocturia) Getting up once a night is common and usually harmless. Twice or more is worth investigating, because the cause is as often in the kidneys, heart or sleep as in the bladder.

Ingredients

What the evidence says about ingredients commonly used in this area.

• Magnesium Magnesium is involved in hundreds of enzyme reactions, and low levels are common in people with type 2 diabetes. That is why it helps some people and not others — the benefit depends on where you start.

Questions people ask

• Can stress raise blood sugar? Yes — and the mechanism is the same one that lets you run from a threat. The problem is that modern stress rarely involves running.