Grapefruit has a low GI of 25, but it will still affect insulin and blood sugar in large amounts.Īdditionally, 100 grams have 7.5 grams of net carbs which is a third of the carb allowance of a strict keto dieter. This is a whole, unprocessed fruit that contains fructose. So, can you have grapefruit on the ketogenic diet? The answer is, it depends on your preferences. If you are on a low-carb diet or a non-strict keto diet, you could still have a small amount if you really want to. While it is an unprocessed, whole food, grapefruit isn’t keto-friendly because it still contains too many carbs for a strict ketogenic diet. Yet, this citrus fruit has many micronutrients, vitamins, and minerals that have many health benefits. However, it still affects insulin and glucose, so large amounts will kick you out of ketosis. This means that it raises blood sugar much slower than pure glucose. The type of sugar that fruits contain, including grapefruit, is fructose. Keep in mind that 100 grams are less than half of this fruit. It has 0.5 grams of protein, 0.1 grams of fat, 7.5 grams of total carbs out of which 1.1 grams is fiber and 6.4 grams are net carbs. If you look into the table with nutritional information, you will see that this fruit is relatively low-calorie. A 100-g serving has 7.5 grams of total carbs and 6.4 are net carbs.Ī cup of unsweetened grapefruit juice (257 g) has 19.5 g carbohydrates and 0.5 g of fiber, thus 19 g of net carbohydrates. There are roughly 15.7 grams of net carbs in a medium grapefruit or 7.9 grams in 1/2 of a grapefruit.
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