Alternate day fasting. Cut your work in half, drop your food budget by 2/3 or so. Cook lentil + onion + carrot + split pea soup in a pot on the weekend, then f

Alternate day fasting. Cut your work in half, drop your food budget by 2/3 or so. Cook lentil + onion + carrot + split pea soup in a pot on the weekend, then freeze it in portion sized boxes for the coming week. Buy bread with very high fiber content to go with it. That makes for one meal a day that's so easy no-one can mess it up, and doesn't take more than two hours a week to arrange in advance.