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Sports nutritionists are constantly asked about which foods runners should eat to boost their performance or their health – and which they should avoid. “Some simply don’t add much benefit and some can be detrimental to performance,” says sports nutritionist Heather Mangieri.

1. Flavoured yoghurt

Dairy is a great source of calcium, potassium and protein, but flavoured yoghurts are usually sweetened with sugar – more than 30g per serving in some cases. “Stick with plain Greek yoghurt,” says Mangieri. It has 8g of natural sugar, plus 20g of protein, per serving.

2. Multigrain bread

“Multigrain” simply means there are a number of different grains in the bread (as opposed to wholegrain, which means all parts of the grain kernel are used), so these loaves can still primarily contain refined white flour.

3. Partially hydrogenated food

If you see partially hydrogenated oils on an ingredients list, the food contains artery-clogging trans fats.

“They increase cholesterol levels and the body can’t easily convert them to energy, so they can also decrease athletic ability,” says Langford. “Check foods like margarine and biscuits – if something has partially hydrogenated oils, skip it.”

4. (That second) beer

Runners love to socialise over post-run beers and you even may have raised a glass to studies that found a pint won’t do much damage – and can even be of benefit. But, as usual, there’s a caveat: drinking more than one can hinder your body’s ability to repair itself.

“Beer has carbs, so have one, but don’t let it replace water,” says nutritionist Jim White. That’s because alcohol is a diuretic, so it can leave you dehydrated. In fact, drink extra H2O if you’re imbibing.

5. Energy drinks

Caffeine can boost performance and make a run seem easier. But get your buzz from a cup of coffee or an energy gel. Research published in the British Journal of Nutrition found that athletes who used energy drinks did see slightly improved performance, but were also more likely to experience agitation, insomnia and nervousness for hours after competition.

6. Nut butter impostors

Peanut and almond butter can be a runner’s best friends – if you’re buying the genuine article. The ingredients list should feature nuts, salt… and that’s about it; if you prefer sweetened versions, opt for those with no more than 3g of sugar per serving, says Langford.

Flavourings such as cinnamon are fine, but watch out for chocolate-and-nut-butter spreads: some contain more than 20g of sugar and 4g of saturated fat per serving (and, often, hydrogenated oils).

7. Protein bars

“Many of my clients think they need a protein bar or shake after they run,” says nutritionist and exercise physiologist Felicia Stoler. “But that usually comes at the expense of the carbs – and real foods – they should be eating.”

8. Sports drinks

Carb-rich electrolyte drinks can be lifesavers during runs that last an hour or more. Too often, though, runners down them during short runs or when they’re not exercising at all.

“Their main ingredient is sugar, and lots of it,” says Langford. “When you’re sitting at work, they’re not giving you a performance benefit – just added calories you don’t need.”

9. Diet fizzy drinks

You know the full-fat fizzy stuff is a bad-to-the-bone source of empty kilojoules and lots of other nutritional nasties, but runners should steer clear of diet drinks, too. A study published in the journal Nature found that artificial sweeteners used in these drinks may alter gut microbes in a way that increases glucose intolerance, potentially increasing diabetes risk.

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