Seven natural tactics.

1. Modest calorie deficit through food quality changes
2. Protein 1.2-1.6 g/kg bodyweight
3. Two cups vegetables at lunch and dinner
4. No snacks in the house
5. Finish eating by 8 PM
6. 7-8 hours sleep
7. Water before every meal

Expect 0.3-0.5 kg/week sustainable without exercise. Adding daily walking would double the rate.