How to lose weight quickly and healthily without spending money or taking medicine?

If you are a girl, you can keep walking for an hour at a speed of 4 kilometers per hour every day, and keep walking for a month without spending money or taking medicine. You can lose weight by eating less animal fat and high-calorie cream chocolate and fried food, and it won't hurt your health. If you hurry up and eat all fruits and vegetables, oats and beans (supplemented with plant protein) in the morning, middle and evening of the week, nothing else will have a significant effect.