Cold Water Swimming: Benefits, Risks and How to Start Safely (UK)

Cold water swimming leaves many people feeling calmer and more alert, but the evidence is mostly small surveys and studies without proper control groups.

Iron-Rich Foods: The Best Sources, for Vegetarians Too (UK)

The richest sources of iron are liver, red meat, shellfish such as cockles and mussels, and fortified breakfast cereals. Good vegetarian and vegan sources include lentils, beans, tempeh, tofu, pumpkin seeds, wholemeal bread and dark green vegetables.

Do Sleep Trackers Work? Accuracy, Sleep Scores and Orthosomnia (UK)

Sleep trackers work well for some things and poorly for others. In lab studies, most rings, watches and bedside devices spot sleep accurately and give a fair estimate of total sleep time.

How to Boost Your Immune System: Best Vitamins and What Works (UK)

The best vitamins for the immune system are the ones you’re short of, and in the UK that’s usually vitamin D: the NHS says to consider 10 micrograms a day from October to March.

Foods That Help You Sleep: What the Evidence Says (UK)

The foods with the most sleep research are kiwi fruit, tart cherry juice, oily fish and milk, while fibre-rich oats and nuts and seeds make good evening picks.

Waking Up With a Headache: Causes and What to Do (UK)

Waking up with a headache is usually down to your sleep or the night before: too little or too much sleep, dehydration, alcohol, missing your usual caffeine, teeth grinding or an awkward pillow.

Sleep Talking: Why It Happens and How to Stop It

Sleep talking (somniloquy) is talking, mumbling or laughing in your sleep without knowing it. It’s common and usually harmless, and there’s no switch to turn it off.

Jet Lag: How to Beat It, East vs West and How Long It Lasts

Jet lag is the poor sleep, daytime tiredness and foggy head you get when your body clock is out of step with a new time zone.

Sleepwalking: Causes, What to Do and When to Worry (UK)

Sleepwalking is when you get up and move about while asleep, usually early in the night. It’s common in children, who mostly grow out of it by their teens.

Hot Flushes: Causes, Triggers and What Really Helps (UK)

Hot flushes are sudden waves of heat in the face, neck and chest, often with sweating, a racing heart and redness.

Tired After Eating? Why It Happens and How to Stop It

Feeling tired after eating is common and usually harmless. Your body clock dips in the early afternoon, and a large meal, a heavy or very starchy lunch, or a drink with it deepens that dip.

Stress Rash: What It Looks Like, Causes and How to Treat It (UK)

A stress rash is usually hives: raised, itchy welts or blotches that can appear on the face, neck, chest or arms when you’re stressed or anxious. It’s usually harmless and normally fades within a few days.