The recommended daily sugar intake varies slightly by health organizations, but generally:

• The World Health Organization (WHO) recommends that free sugars should be less than 10% of total daily calories, which corresponds to about 50 grams (approximately 10 teaspoons) of sugar per day for an average adult consuming 2,000 calories. They also suggest a further reduction to less than 5% of total calories (about 5 teaspoons) as a sensible long-term goal.

• The UK NHS recommends adults consume no more than 30 grams of free sugars per day (around 7 teaspoons).

• The American Heart Association (AHA) advises men to have no more than 36 grams (9 teaspoons) and women no more than 25 grams (6 teaspoons) of added sugar per day.

• The US Dietary Guidelines for Americans recommend limiting added sugars to less than 10% of daily calories, about 50 grams of sugar per day on a 2,000-calorie diet.

For children, recommended sugar intake is lower and varies by age, with amounts from about 10 grams up to around 42 grams depending on age group.

In summary, adults should aim to keep added or free sugar intake between about 25 to 50 grams per day, with some health authorities favoring more conservative limits closer to 25-30 grams for optimal health.