What this means is that by changing only one hormone, “suddenly you change your entire relationship with food”, says Prof Giles Yeo, an obesity scientist at the University of Cambridge. And that has all sorts of implications for the way we think about obesity.

It should go without saying, but evidently, it bears repeating: you can’t tell how healthy someone is just by looking at their body type (and even if you could, a person’s health has no relation to their value as a human).