Recommendations for losing weight

Hail! I want to advise you the working method for losing weight, which was held before my eyes, and helped my sister, who at the age of 16 weighed more than 120kg, and lost weight in 3 months at 70kg.
So we start the breakfast with a glass of water for half an hour before breakfast, we prepare 180g of oatmeal for breakfast, it is possible with a salad.
For lunch, before dinner try to take 2-2.5 liters of water and prepare a vegetable stew, you can add the tuna and at the end for dinner we prepare the salad you can add fish and even this you can take non-fat yogurt.
this method really worked, you can of course still pamper yourself with sometimes low-calorie food, but in moderation.
Good luck to you, dear women!