Silberengel @Silberengel - 4d
People successfully starve themselves to death because one sign of hunger is fatigue, so they just lie down, happily, and drift away, very slowly. The body gives up hope, at some point, and just runs down the reserves. It's a hibernation function, for bad harvest years. Don't recommend turning it into a lifestyle.
JackTheMimic @JackTheMimic - 2d
This is in pretty extreme. Fatigue happens only after most fat stores are depleted and most muscle as well. Hunter gatherers would not have survived if after one failed hunt they got more tired than they were when they failed the hunt. This sort of thing sets in around 25 days of absolutely no nutrition.