The healthiest pursuits like sleeping, or drinking water can be bad for you if you overindulge. Even overdosing on antioxidants — which help combat free radicals in your body — can compromise your system’s natural defences, say scientists. So, how much is too much? We ask the experts.
RDA: 6 1/2 to 7 1/2 hours.
Overdose: A recent study found men who logged nine or more hours a night were 43 per cent more likely to have heart disease than seven-hour sleepers, since hypersomnia (oversleeping) can stall your metabolism.
Recommended daily allowance (RDA): 400mg. An average cup has around 80mg.
Overdose: Heavy use – more than 500mg a day – can cause insomnia, anxiety and muscle tremors, according to US research. Pull back your daily dose with Arabica beans, for less caffeine, without sacrificing flavour.
RDA: Having sex less than once a week increases the risk of erectile dysfunction.
Ideal dose: Three times a week halves cardio problems. “Sex means better oxygenation and a healthier heart,” says Dr Emmanuele Jannini, a professor of endocrinology and sexology from Italy.
Overdose: Having sex 20 times a month or more in your 20s could lead to a raised risk of prostate cancer in your 50s, according to University of Nottingham research. Russell Brand need not look so smug.
RDA: 0.75g per kg of body weight. So if you’re 76kg, you’ll need 57g daily.
Ideal dose: Eat around 5g with every meal to build muscle and regulate your metabolism.
RDA: 3 1/2 litres.
Ideal dose: According to the American Journal of Epidemiology, men who drink five glasses a day have a 54 per cent lower risk of heart disease.