These images showing three portions of the same meal reveal the exact amount of food you need to eat to lose, maintain or gain weight (and the difference between them is huge)

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• Study by British Medical Journal found that people rely on sight to portion food

• It can lead to people consuming an extra 300 calories a day, it was reported

• New images reveal exactly how much to eat depending on your diet plan

• They all feature healthy meals in three different portion sizes 

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