The best foods to eat when breaking a fast are nutrient-dense, easy to digest, and moderate in portion size. Eggs, avocado, unsweetened yogurt, and bone broth are all strong choices. What you want to avoid is just as important: large portions, high-fat meals, raw vegetables, and sugary drinks can cause bloating, cramps, and nausea when your digestive system hasn’t processed food in hours.
How carefully you need to approach your first meal depends largely on how long you’ve been fasting. A 16-hour intermittent fast requires far less caution than a multi-day water fast. Here’s how to handle both scenarios and everything in between.
Why Your First Meal Matters
When you fast, your digestive system downshifts. Stomach acid production slows, and the muscles that move food through your gut become less active. Eating a heavy or hard-to-digest meal forces your body to ramp back up too quickly, which is why people often feel bloated, nauseated, or crampy after breaking a fast with the wrong foods. The longer the fast, the more gradual the restart needs to be.
Your body also becomes more sensitive to insulin during a fast. That’s generally a good thing for metabolic health, but it means a high-sugar meal will spike your blood glucose more sharply than it would on a normal eating day. Pairing carbohydrates with protein and fat blunts that spike and gives you steadier energy.
Best Foods for Breaking a Fast
For fasts under 24 hours, including common patterns like 16:8 or 18:6, you don’t need to overthink it. Focus on foods that are gentle on the stomach and provide a balance of protein, healthy fat, and some complex carbohydrates.
- Eggs: Easy to digest, high in protein, and versatile. Scrambled or soft-boiled is easier on the stomach than fried.
- Avocado: Rich in monounsaturated fat and potassium, which helps replenish electrolytes lost during fasting.
- Unsweetened yogurt or kefir: Fermented foods contain beneficial bacteria and are easier to digest than unfermented dairy. The fermentation process partially breaks down lactose, so even people with mild lactose sensitivity can often tolerate them.
- Bone broth or vegetable soup: Warm liquids are gentle on the stomach and provide sodium and other minerals. Broth also helps with hydration.
- Cooked vegetables: Steamed or sautéed spinach, zucchini, or sweet potato digest more easily than raw vegetables.
- Fish or chicken: Lean protein sources that won’t sit heavy in your stomach the way a steak or burger might.
How Much Protein You Actually Need
If you’re fasting and concerned about muscle loss, protein at your first meal deserves attention. Research published in Frontiers in Nutrition found that roughly 0.25 grams of protein per kilogram of body weight in a single meal is enough to trigger muscle protein synthesis at rest. For a 70-kilogram (154-pound) person, that’s about 17 to 18 grams of protein, or roughly three eggs.
If you’ve been exercising during your fast or are in a calorie deficit, you likely need more. Estimates suggest 0.4 to 0.5 grams per kilogram may be necessary to maximize the muscle-building response when your body is energy-depleted. For that same 154-pound person, that’s 28 to 35 grams, roughly equivalent to a chicken breast or a large serving of Greek yogurt with a couple of eggs. Spreading your total daily protein across multiple meals after breaking your fast is more effective than trying to cram it all into one sitting.
Foods to Avoid Right After a Fast
Some foods that are perfectly healthy on a normal eating day become problematic on an empty stomach.
High-fat foods like fried items, cheese-heavy dishes, and greasy takeout take significantly longer to digest and can cause nausea when your gut is just waking up. Raw cruciferous vegetables (broccoli, cauliflower, cabbage) and large salads are high in fiber, which sounds healthy but can cause gas and bloating when your digestive system hasn’t been active. Nuts and seeds fall into the same category.
Sugary foods and fizzy drinks spike blood glucose rapidly and the carbonation adds gas to an already sensitive stomach. Caffeine on an empty stomach can cause cramps and diarrhea, and its diuretic effect works against rehydration. If you need coffee, have it alongside or after your first meal rather than before it.
Portion size matters as much as food choice. Breaking a fast with a large meal, even a healthy one, can cause severe acid reflux and stomach cramps. Start with a moderate portion and eat slowly. You can always have a second meal an hour or two later.
Breaking a Longer Fast (24 to 72 Hours)
For fasts lasting a full day or longer, a phased approach works best. Start with something liquid or semi-liquid: bone broth, a small smoothie, or a cup of yogurt. Wait 30 to 60 minutes. If that sits well, move to a small meal with cooked vegetables, some protein, and a source of healthy fat. Within a few hours, most people can return to normal eating.
The key nutrients to prioritize are electrolytes. Potassium, magnesium, and phosphorus all drop during extended fasts. Foods like avocado, bananas, cooked spinach, and pumpkin seeds help restore these levels naturally.
When Refeeding Becomes a Medical Concern
For the vast majority of people doing intermittent fasting, refeeding syndrome is not a risk. It becomes a clinical concern after food deprivation lasting more than seven days, particularly when there’s evidence of physical stress and nutrient depletion. The condition involves dangerous shifts in phosphorus, potassium, and magnesium that can affect heart rhythm and organ function. It typically develops within the first five days of eating again.
If you’ve fasted for more than five to seven days, reintroduction should be medically supervised. Research on hunger strikers who fasted for 43 days showed that a careful, stepwise refeeding process took nine full days before patients could tolerate unrestricted food. That’s an extreme case, but it illustrates why very long fasts require professional guidance during the recovery phase.
A Simple Refeeding Template
For a standard intermittent fast of 16 to 24 hours, here’s a practical approach:
- First 15 minutes: A glass of water, optionally with a pinch of salt or a squeeze of lemon. If your fast was on the longer side, a small cup of bone broth works well here.
- First meal (within 30 minutes): A moderate plate with protein (eggs, fish, chicken), a healthy fat (avocado, olive oil), and a cooked vegetable or small portion of complex carbs like sweet potato or rice.
- Second meal (1 to 3 hours later): Eat normally. By this point your digestive system is fully active and you can include raw vegetables, nuts, higher-fiber foods, and larger portions without issues.
The shorter your fast, the less rigid you need to be. Someone finishing a 16-hour overnight fast can often sit down to a full breakfast without any problems. Someone ending a 36-hour fast should take it slower. Pay attention to how your stomach feels after the first few bites and adjust from there.