Exercise will of course help and has many benefits, but cut out the PUFAs (especially seed oils) and processed sugars and the body naturally returns to a healthy size, without having to count calories or anything else. You want the majority of your fat intake to be long chain saturated fats. It also helps to eat collagen, which is the modern way of doing what our ancestors did and eating the bones/skin/eyes/organs/etc.
Exercise will of course help and has many benefits, but cut out the PUFAs (especially seed oils) and processed sugars and the body naturally returns to a healthy size, without having to count calories or anything else. You want the majority of your fat intake to be long chain saturated fats. It also helps to eat collagen, which is the modern way of doing what our ancestors did and eating the bones/skin/eyes/organs/etc.