Those who recommend products are liars.
Painless way:
Drink eight-treasure porridge, cook all kinds of beans and rice in a large pot, eat it as a meal every day without sugar, and lose weight. I tried. I lost almost ten pounds a month. I'm not hungry if I don't exercise.
My mother's method is to walk more at ordinary times, striding fast, walking for 2 hours at 8: 00 or 9: 00 every night, and losing 20 pounds a year.
In addition, stand with your chest out and your stomach in, and never sit or lie down.
Eat more vegetables to prevent constipation.