You used to be able to buy go lower bars in supermarkets. Haven't seen them recently, but they are still in many health food shops.
But, I think moo-moo was referring to the go lower diet which is a the whole kaboodle of a weeks food. Lunch, dinner, breakfast. Hot meals, soup etc.
It's all planned out and they send you the whole weeks food.
It's available on the golower website.
Go Lower » The guaranteed way to drop a dress size in 28 days