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On a keto diet, keep added sugar near zero; most people fit only 0–10 g within a 20–50 g daily net-carb limit.

Yes, you can eat small amounts of sugar and stay in ketosis, but only if total daily net carbs remain low enough.

There’s no single limit; people with diabetes benefit from keeping added sugars under 10% of calories (ideally 5%) within their carb plan.

Yes—when the topic is a 1-year-old, the target is zero added sugar; natural sugar from milk and fruit is fine in normal portions.

For a 10-month-old, added sugar should be avoided; stick to whole foods and unsweetened drinks.

A 3-year-old should stay under 25 g of added sugar per day, with a safer cap near 14–19 g of free sugars from all sources.

A 2-year-old should keep added sugar under 25 g per day, skip sugary drinks, and enjoy whole fruit for sweetness.

For diabetes, keep added sugar low—aim for under 5–10% of calories and choose carbs with fiber to steady blood glucose.

For teenager sugar intake, most teens should cap added sugar near 25 g a day; a 10% of calories cap allows 25–50 g depending on energy needs.

There isn’t a fixed sugar amount that “causes” diabetes; risk climbs with high added sugars and sugary drinks, while diagnosis uses blood tests.