digest
Short Summary
Main recommendation: On a ketogenic diet, the best fruits are low-net-carb options such as blackberries, strawberries, raspberries, and avocado, while higher-sugar fruits like bananas, mangoes, pears, grapes, and dried fruit should be avoided. Dr. Zyrowski explains that fruit sugar (fructose) is more burdensome to the liver than glucose and can disrupt ketosis, so people with fatty liver or insulin resistance may need to avoid fruit altogether.
Key Points
- Fructose, the sugar in fruit, must be converted by the liver into glucose before the body can use it, which makes it harder on the liver than glucose.
- Fructose does not cause a quick blood sugar spike like glucose does, but it has a longer-lasting effect on blood sugar and can lower ketone levels.
- Individual tolerance varies: healthy people may handle a little more fruit, while people with fatty liver or significant insulin resistance may need to avoid it entirely.
- Dried fruit is especially risky because it concentrates sugar and can spike blood sugar and knock someone out of ketosis.
Details Worth Noting
- Concrete instructions:
- Choose low-carb fruits such as blackberries (about 6 g net carbs per cup), raspberries (about 7 g), and strawberries (about 8 g) as the best options.
- Use avocado (about 4.5 g net carbs per cup), which the speaker classifies as a fruit, as a keto-friendly choice.
- Use lemon or lime in water or on food, since typical amounts add little carb load; a full cup of either is not a realistic serving.
- Limit grapefruit (about 11 g net carbs per cup) and green apple (about 12 g per cup); if you want green apple, have only a small portion on a given day.
- Avoid bananas (about 30 g per cup), mangoes (about 30 g), pears (about 31 g), grapes (about 26 g), pineapple (about 19 g), and cherries (about 18 g).
- Avoid dried fruits such as dried bananas and dried apricots, which the speaker says spike blood sugar.
- Net carb figures are given per one-cup serving, so portion size matters greatly.
- The speaker says the tolerance for fruit depends on health status, so someone with fatty liver or insulin resistance should be especially cautious and may need to avoid fruit altogether.
- The speaker refers viewers to a separate video on a beginner's keto grocery list for more foods to include.
Bottom Line
Fresh berries and avocado are the safest fruit choices on keto, while tropical fruits, dried fruit, and high-sugar fruit should be avoided, and people with liver or insulin issues should consider cutting fruit out entirely.
