Peter Attia· MD
the 200 pound person loses 40 pounds they're now 160 pounds the other person's always been 160 pounds on the surface they look identical in fact let's pretend they're siblings but one was obese and he's now post obese the other was never obese let's pretend that that one that lost the 40 pounds has really kind of dialed it in and doesn't yo-yo he manages to stay there it's three years later are they the same person yet no probably not