Smoothies are a quick, convenient and delicious way to up your intake of nutrient-rich fruit before that morning workout. But when it comes to DIY drink mash-ups, knowing the right ingredients can mean the difference between a fat-burning boost and a blood-sugar disaster. Read on to discover your nutritional champions and the worst offenders in your fruit bowl, which may be doing your workout more harm than good.

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The Good Guys

Strawberries

Anything that tastes this great can’t be good for your waistline, right? Wrong. Not only do strawberries contain a measly 5g of sugar per 100g, they also provide polyphenols that help to regulate blood sugar, reducing the risk of fat-storing spikes.

Blueberries

Quite possibly the healthiest fruit of all, these blue bundles of goodness contain pterostilbene, a compound that helps the body to break down fat. Plus 100g contains just 7.3g of the sweet stuff.

The Half-Decent Guys

Raspberries

Like their blue cousins, these berries are packed with health benefits, including high levels of calcium, which will boost your metabolism and help you burn fat more efficiently. Their sugar content? A respectable 9.5g per 100g.

Kiwi fruit

They might be rich in immunity-boosting vitamin C and filling fibre, but at 10.5g sugar per 100g, these hairy green treats should be used sparingly in your smoothies.

The Bad Guys

Grapes

Unlike strawberries, there’s a reason why grapes are so delicious – namely that they’re brimming with sugar, with an 100g serving boasting just shy of 15g. On the plus side, they also offer respectable levels of bone-strengthening vitamin K.

Mango

These juicy South Asian treats are a great source of vitamins A and C, but they also contain a monstrous 18g of sugar per 100g. Indulge with extreme caution.