Answer: Pineapple is not keto, as it's too high in sugar.
As delicious as pineapples are, they are unfortunately not keto friendly.
A single 100 g serving of pineapple is 12g of net carbs, including 10g of sugar, which is very high for someone on a keto diet. Prefer other keto-friendly fruits, such as blackberries and strawberries.
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