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This may sound complicated, but to help you get your portion sizes right, Polina Marchenko, founder at KptnCook, a healthy cooking app for beginners, says you only need to use your hands. In a balanced meal or even when snacking, a serving of carbs should be about the size of your fist, a serving of fat the size of the tip of your thumb and a serving of protein the size of your palm. This infographic shows you how to use your hands to measure your portions.