Here are the possible short- and long-term effects of the diet. Watermelon is a flavorful and hydrating fruit that’s easy to add to a ketogenic diet. As such, many high carb foods are considered off-limits on this diet, including certain types of grains, starchy vegetables, legumes, and fruits. Research also suggests that eating such foods is associated with a reduction in the risk of developing cancer and heart disease. The CNS cannot use fatty acids as a source of energy since free fatty acids cannot cross the blood-brain barrier
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