What to eat in your eating window

Fasting sets the when. What you eat in the window decides whether the next fast is effortless or a fight. Two levers do most of the work: protein and fibre.

The Kairo Guide · 4 min read

A common mistake is treating the eating window as a free-for-all. You don't have to be strict, but a little structure makes fasting dramatically easier — because it flattens the hunger curve that would otherwise ambush you two hours into your fast.

1. Protein first, every meal

Lead each meal with a real protein source — eggs, Greek yogurt, chicken, fish, tofu, tempeh, legumes. Protein is the most satiating macronutrient and it protects muscle while you fast. Aim to make it the anchor of the plate, not an afterthought.

2. Add fibre for lasting fullness

Vegetables, legumes, and whole grains slow digestion and keep you full deep into the fasting hours. A window that's all refined carbs digests fast and leaves you hungry early.

3. Time your sugar early

If you want something sweet, have it earlier in your window — not as the last bite before your fast. Ending on protein and fibre rather than a sugar spike means you glide into the fast instead of crashing into it.

A simple template

• Meal 1 (break-fast): protein + vegetables + a smart carb (e.g. eggs, greens, whole-grain toast).
• Meal 2 (close): protein-forward again, plenty of fibre, healthy fat for satiety.
• Optional snack: protein-led — Greek yogurt, a boiled egg, edamame.

General information only, not medical advice. Consult a healthcare professional before starting any fasting routine, especially if you are pregnant, under 18, have a medical condition, or a history of disordered eating.