Los mejores alimentos para romper el ayuno: lo que tu cuerpo realmente necesita

Durante el ayuno, tu sistema digestivo se adapta. Comenzar con alimentos pesados puede causar malestar digestivo. Empieza con alimentos de fácil digestión.

Verduras al vapor, caldos, pequeñas porciones de proteína y alimentos fermentados como el yogur son excelentes. Evita al principio los alimentos procesados y los carbohidratos refinados.

Evita los fritos, grandes porciones de carne y snacks azucarados directamente después del ayuno. Estos pueden elevar el azúcar en sangre demasiado rápido.

Bebe agua primero, luego tras 10-15 minutos toma una pequeña comida ligera. Espera una hora antes de comer una comida completa.

Fasts extending beyond 24 hours require more careful refeeding than standard intermittent fasting windows. The digestive system has been dormant for a full day or more, and enzyme production, stomach acid, and intestinal motility have all decreased significantly. The refeeding strategy for a 24 to 48 hour fast should follow a two-phase approach.

Phase one (first 30 to 60 minutes): begin with a small, easily digestible meal of around 300 to 400 calories. Bone broth, a small portion of scrambled eggs, or a few spoonfuls of plain yoghurt with a small banana are all excellent choices. This initial food signals the digestive system to restart enzyme and acid production without overwhelming it. Chew thoroughly — mechanical breakdown in the mouth is even more important when enzyme levels are low.

Phase two (one to two hours after phase one): eat a normal-sized, balanced meal containing protein, complex carbohydrates, healthy fats, and cooked vegetables. At this point the digestive system has had time to ramp up and can handle a full meal. Continue eating normally through your remaining eating window, prioritising protein to replenish amino acid pools that were drawn down during the fast.

For fasts extending beyond 48 hours, refeeding syndrome becomes a genuine medical concern. This potentially dangerous condition involves rapid shifts in electrolytes (particularly phosphorus, potassium, and magnesium) when insulin spikes in response to carbohydrate intake after prolonged fasting. Extended fasts should always be supervised by a healthcare professional, and refeeding protocols should follow medical guidelines.

One of the primary benefits of intermittent fasting is improved insulin sensitivity, and the way you break your fast can either enhance or undermine this benefit. The glycaemic response to the first meal after fasting is amplified because insulin sensitivity is at its peak. This heightened sensitivity is a double-edged sword: it means glucose is cleared from the blood efficiently, but if you consume a high-glycaemic meal, the exaggerated insulin spike can cause reactive hypoglycaemia (a blood sugar crash below baseline), leading to fatigue, irritability, shakiness, and intense cravings.

The most effective strategy is to include protein and fat in your first meal alongside any carbohydrates. Protein stimulates a moderate insulin release while also triggering glucagon, which counterbalances the blood sugar-lowering effect. Fat slows gastric emptying, spreading glucose absorption over a longer period and flattening the glycaemic curve. Fibre (from cooked vegetables or whole grains) similarly slows absorption. A practical example: instead of breaking your fast with oatmeal alone (moderate-to-high glycaemic load), pair it with Greek yoghurt and a handful of walnuts. The protein and fat transform the blood sugar response from a sharp spike and crash into a gentle rise and sustained plateau.

Apple cider vinegar (1 to 2 tablespoons diluted in water) consumed 10 to 15 minutes before the first meal has been shown in multiple studies to reduce the postprandial glycaemic response by 20 to 35 percent. The acetic acid slows gastric emptying and inhibits disaccharidase enzymes in the small intestine, reducing the rate of carbohydrate absorption. This is a simple, inexpensive strategy that pairs well with any first-meal approach.

If you found this guide useful, the following deeper reads expand on neighbouring topics and will help you put the principles into practice across the rest of your kitchen routine: What Breaks a Fast? 40 Foods and Drinks Tested, Intermittent versus continuous energy restriction on weight loss and cardiometabolic outcomes: a systematic review and meta-analysis of randomized controlled trials, Global, regional, and national comparative risk assessment of 84 behavioural, environmental and occupational, and metabolic risks or clusters of risks, 1990–2016: a systematic analysis for the Global Burden of Disease Study 2016. Each of these has been written to stand alone, so dip in wherever the topic feels most relevant to what you are working on this week — together they form a connected library of practical, evidence-based home-cooking knowledge that grows more useful the more of it you read.

The guidance in this article draws on peer-reviewed nutrition and food-science literature as well as guidance from major public-health bodies. Key reference sources we have consulted while writing and updating this piece include:

• Harvard T.H. Chan School of Public Health, *The Nutrition Source*, 2024. • U.S. National Institutes of Health (NIH), Office of Dietary Supplements, fact sheets, 2024. • World Health Organization (WHO), Healthy Diet fact sheet, 2024. • Cochrane Database of Systematic Reviews — relevant systematic reviews, 2020–2024. • British Dietetic Association (BDA) Food Fact Sheets, 2024.

These references are provided so that motivated readers can verify claims and explore the underlying evidence directly. Where a specific trial, meta-analysis, or named author is referenced in the body of the article, that citation takes precedence over the general sources listed here. The article is reviewed periodically against newly published evidence and updated when meaningful new findings emerge.