How to Use the Next Meal Interval Calculator
Eating the same portion size can leave you feeling hungry again at very different times depending on whether the meal was rice-heavy or meat-and-fried-food-heavy. That's because different nutrients spend different amounts of time in the stomach. Carbs break down relatively fast and typically clear the stomach in around 2 hours, while protein needs several stages of enzyme action and takes 3 to 4 hours, and fat digests slowest at 4 or more hours. This calculator factors in the main nutrient and portion size of your last meal to suggest an appropriate gap before your next one.
Portion size also affects digestion time. A light, snack-sized meal may only need about 80% of the base digestion time, while overeating can push that time up by 30% or more. Treat the calculated interval as an average guideline for planning your next meal rather than an exact rule for when your stomach is fully empty.
Eating again before your last meal has finished digesting can add up and lead to bloating or discomfort. If you ate something greasy late at night, using the calculated interval to adjust your late-night snack or next morning's breakfast time can help reduce that digestive load.
Frequently Asked Questions
Carbs break down relatively quickly in the stomach, while protein and fat require slower enzyme action and gastric emptying, so they stay in the stomach longer. That's why a meat- or fried-food-heavy meal takes longer to digest than a rice-heavy meal of the same size.
Eating again before your previous meal is mostly digested can add strain on your stomach and cause bloating. That said, this is an average guideline, not an absolute rule, so adjust it based on your own digestion.