Is It Okay to Eat Sugar While Fasting?

Sep 15, 2026

Eating sugar during a fasting window generally breaks the fast because sugar provides calories and can raise blood glucose and insulin levels. This includes table sugar, honey, jaggery, sweetened tea or coffee, juices, soft drinks, sweets, and biscuits.

What Can You Have During a Fast?

For most intermittent-fasting plans, choose:

  • Plain water.

  • Unsweetened tea.

  • Black coffee without sugar or milk.

  • Water with no added calories.

Even a small amount of sugar in tea or coffee counts as breaking a strict fast. “Natural” sweeteners such as honey, jaggery, coconut sugar, and date syrup are still sources of sugar and calories.healthline

What About Sugar After Fasting?

You can include a small sweet treat during your eating window, but avoid breaking a fast with a large sugary meal. Excess sugar may cause a rapid blood-glucose rise, followed by hunger and tiredness. Instead, break your fast with water and a balanced meal containing protein, fibre, healthy fats, and minimally processed carbohydrates.

For example, choose curd with nuts, eggs with vegetables, or dal with roti and salad instead of sweetened drinks and fried snacks. WHO recommends limiting free sugars to less than 10% of daily energy intake, with additional benefits at less than 5%.who

Important Note

People with diabetes, those taking glucose-lowering medicines, pregnant or breastfeeding women, and anyone with a history of eating disorders should seek medical advice before fasting. Fasting can affect blood-glucose levels and medication needs.

Bottom line: Keep your fasting window free from sugar and calorie-containing foods. Save sweets for the eating window and enjoy them occasionally in a small portion.