16:8 intermittent fasting is the most popular form of time-restricted eating — you fast for 16 hours and eat within an 8-hour window (typically midday to 8pm). Unlike traditional diets that dictate what to eat, 16:8 focuses on when. The benefits reported include improved insulin sensitivity, reduced inflammation, better metabolic health, and for many people, effortless calorie reduction. But what you eat in your eating window still matters enormously.
How 16:8 intermittent fasting works
During the fasting window, your insulin levels fall, and your body transitions from burning glucose to burning stored fat for fuel. After roughly 12–14 hours of fasting, glycogen stores deplete and fat oxidation increases. The 16-hour window allows this metabolic shift to occur daily. You can drink water, black coffee, and plain tea during the fasting window — these don't break a fast. The eating window of 8 hours gives you flexibility while still delivering the benefits.
What to eat in your eating window
The eating window is not a free pass. The best outcomes come from eating whole, nutrient-dense foods that support stable blood sugar and satiety. Two to three satisfying meals work better than constant snacking. Prioritise protein at each meal (it's the most satiating macronutrient and helps preserve muscle during calorie restriction), plenty of vegetables and fibre, healthy fats, and complex carbohydrates rather than refined ones.
Breaking your fast: what to eat first
Your first meal after 16 hours of fasting should be balanced and not excessively large. A protein-rich meal with vegetables and some healthy fat is ideal — it provides steady energy and prevents a blood sugar spike. Good options include eggs with vegetables and avocado, a Greek yoghurt bowl, a salad with grilled chicken or salmon, or a protein smoothie. Avoid breaking your fast with highly processed, sugary foods — the post-fast insulin sensitivity means blood sugar spikes are more pronounced.
Sample 3-day 16:8 meal plan (eating window 12pm–8pm)
Day 1: 12pm (break fast) — Greek yoghurt with berries, walnuts, and a drizzle of honey; 3pm — grilled chicken salad with avocado, mixed leaves, and lemon-olive oil dressing; 7pm — baked salmon with roasted sweet potato and steamed broccoli. Day 2: 12pm — two-egg omelette with feta, spinach, and tomatoes; 3:30pm — lentil and roasted vegetable soup with rye bread; 7:30pm — chicken stir-fry with brown rice and pak choi. Day 3: 12pm — smoked salmon and avocado on sourdough; 4pm — cottage cheese with cucumber, cherry tomatoes, and seeds; 7pm — lamb chops with roasted Mediterranean vegetables and quinoa.
Intermittent fasting and exercise
Morning exercise in a fasted state is popular and generally well-tolerated, though performance may be slightly reduced for high-intensity sessions. For those training hard, scheduling the eating window to include a post-workout meal is important for muscle recovery. Protein intake within a few hours of training remains relevant regardless of fasting protocol.
How Nouri plans 16:8 meals
Nouri's intermittent fasting mode generates 3-day meal plans structured for a midday-to-8pm eating window — typically three meals that are satisfying enough to carry you through a 16-hour fast. A full shopping list is included, and the AI avoids repeating meals you've already seen.