If you've been trying to lose weight, you've probably experimented with a couple of diets. You may have tried a low-carbs diet or cut out fat, sugar, and salt. But Harvard researchers say there is ONE diet that is the MOST effective in cutting kilos.

A Mediterranean diet, say scientists, is the most effective--and heart healthy--diet in the world. They asked 998 overweight people to live on the Mediterranean diet for a year, and found that they lost between 5 and 11 kilos. But there are more benefits: people on a Med diet significantly reduced their risk of heart disease and also added anti-ageing benefits to their arsenal.

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So what is the Mediterranean diet? It's a diet primarily based on consuming fruits, vegetables, and whole grains, with seafood and olive oil. Salt is mostly replaced with spices and herbs.

The main ingredient in a Med diet is olive oil, which is the perfect weight-loss addition. According to studies, olive oil increases the amount of energy your body uses when you rest, which means you burn calories even when you sleep or sit. In fact, even the smell of olive oil can make you feel fuller and eat less. Swap your regular oil and dressing with olive oil to get these benefits.

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Next, eat Greek yoghurt daily--it's low in calories, high in protein and contains calcium (increasing your calcium intake can reduce belly fat). This combination helps burn fat and promotes weight loss. Can't find Greek yoghurt? Make your own by straining regular yoghurt in a cheese cloth for two hours.

Increase your vegetable intake, as part of a Mediterranean diet. These will give your body the vitamins, minerals, and nutrients it needs to fight infections and up metabolism. Add green, red, orange, yellow, blue, purple, black, brown, and white veggies to your diet, daily, to ensure a wide range of benefits and flavours.

And don't forget to add some fish to your diet. Eating fish and shellfish twice a week can increase your metabolism by as much as 400 calories a day!

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