Yes, sugar will break a fast.
The primary goal of fasting is to avoid calorie consumption, and sugar contains calories. Consuming sugar during a fast will negate the benefits you're aiming to achieve.
Why Sugar Breaks a Fast:
- Caloric Intake: According to provided references, "The most critical factor for an effective fast period is avoiding calories and sugar." Sugar provides calories, which interrupts the fasting state.
What to Avoid During a Fast:
Besides obvious sources of sugar, be mindful of hidden sugars and calorie-containing ingredients, according to the reference:
- Alcohol: Beer, wine, and liquor contain calories and should be avoided.