Which type of food decreases leptin?

Supplement glutamine. Instead of focusing on leptin diet if you take l-glutamine supplements 1000mg at night and any time you have cravings you can turn on the satiation response in brain and naturally start the weight loss.
Fish-rich diet. Fish rich diet helps decrease inflammation and leptin - indirectly helping body to secrete its own leptin and stimulate satiation response in brain vs carbohydrate rich, fruit rich diets which increases leptin in body.