In this article
Editorial update: September 29, 2026. Text prepared with AI assistance, based on the sources cited. No independent clinical review. General information, not an individual meal plan.
Short answer
In most versions of keto, no. The Harvard Nutrition Source itself cites “a crisp apple” as an example of a food that people on keto have to give up. 100 g of Fuji apple with skin has 15.2 g of carbohydrate, equal to 30% of a 50 g daily limit and 76% of a 20 g limit.
How many carbs do apples have?
| Food | Total carbohydrate (g) | Fiber (g) |
|---|---|---|
| Apple, Fuji, with skin, raw | 15.2 | 1.3 |
| Apple, Argentine, with skin, raw | 16.6 | 2.0 |
| Strawberry, raw | 6.8 | 1.7 |
Which fruits are allowed
According to the lists Harvard summarizes, the exception is berries, in small portions; other fruits are only included if they fit within the day’s carbohydrate limit. Raw strawberries have 6.8 g of carbohydrate per 100 g, less than half the amount in Fuji apples.
If you have diabetes, take medication, or are pregnant or breastfeeding, talk to a professional before changing your diet. The list of allowed foods helps with planning. For precautions to take before you start, see ketogenic diet risks and precautions.
Sources
- Harvard T.H. Chan School of Public Health, The Nutrition Source: Diet Review: Ketogenic Diet for Weight Loss
- TACO – Tabela Brasileira de Composição de Alimentos, 4ª edição revisada e ampliada (NEPA/Unicamp)
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