Belly fat responds to a calorie deficit and to specific biological inputs beyond calorie count. You can achieve real belly-fat reduction without exercise — the path is different but viable.

The belly-fat-specific inputs

1. Sleep 7-8 hours. Undersleep specifically drives visceral (belly) fat via cortisol. Single biggest intervention.
2. Reduce stress. Chronic stress = chronic cortisol = visceral fat storage. Daily 10-minute walks, meditation, or whatever works for you.
3. Calorie deficit of 300-500 kcal/day. Via food, since exercise is off the table. Adequate but not aggressive.
4. Protein at 1.2-1.6 g/kg. Preserves muscle during deficit; protein keeps metabolism from dropping as far as it would on low-protein deficits.

Diet structure

• Eggs for breakfast (30-40 g protein)
• Two cups of vegetables at lunch and dinner
• No late-night eating (finish by 8 PM)
• Limit refined carbs (white flour, sugar, sugary drinks)
• Include fermented foods (yogurt, kimchi) for gut health
• Water before every meal — displaces calorie-dense drinks

Environmental design

• Don't keep snacks in the house
• Cut vegetables at eye level in the fridge
• Smaller plates
• Coffee black instead of sugared milk drinks

What to expect

Without exercise, fat loss is slower (~0.5 lb/week sustainable) but entirely feasible. 6-8 weeks of consistent execution produces visible belly reduction for most people. Adding even 20 minutes of daily walking accelerates results substantially — but if that's off the table, the above still works.