MCTs are medium chain triglycerides, i.e. different to long chain triglycerides (LCTs), as in regular fats. Due to their different chemical configuration, MCTs are absorbed and processed differently to normal fat. LCTs have to be broken down in digestion, combined with a protein and shuttled through the lymphatic system to the liver. In the liver fats are broken down to free fatty acids, which are either stored as body fat or used as fuel. MCTs enter the bloodstream directly, and can be immediately used for energy; i.e. they're like a more energy-dense form of dietary carbohydrate.
MCTs can be bought as a liquid fat, and whilst not necessary by any means, can be useful for the hard gainer who struggles to eat enough for sufficient energy.
"MCTs ...can be immediately used for energy."
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