He didn’t explain the concept of a set point very well.
Your body’s set point is a weight that it wants to go back to. The set point can change, but not without great effort. Small efforts will simply result in temporary weight gain/loss and eventual reversion to the set point weight. Great efforts (long term changes in diet and lifestyle, not just a 7 day juice fast) are required to re-set your set point higher or lower.
Think of a hamster crawling up a giant mixing bowl or something, set on a particular spot on the kitchen floor. The hamster can walk forwards up the side of the bowl, but the bowl has not moved and since the sides of the bowl are very steep, the hamster will slide back down to the middle of the bowl where he started. If he wants to get to a different part of the kitchen, he will have to really slam his body against the side of the bowl, or work hard in a different way, to “nudge” the whole bowl across the floor so it’s now sitting at a different “set point”
Your body’s set point is a weight that it wants to go back to. The set point can change, but not without great effort. Small efforts will simply result in temporary weight gain/loss and eventual reversion to the set point weight. Great efforts (long term changes in diet and lifestyle, not just a 7 day juice fast) are required to re-set your set point higher or lower.
Think of a hamster crawling up a giant mixing bowl or something, set on a particular spot on the kitchen floor. The hamster can walk forwards up the side of the bowl, but the bowl has not moved and since the sides of the bowl are very steep, the hamster will slide back down to the middle of the bowl where he started. If he wants to get to a different part of the kitchen, he will have to really slam his body against the side of the bowl, or work hard in a different way, to “nudge” the whole bowl across the floor so it’s now sitting at a different “set point”