I think a lot of these are "old wives tales"
3) The eating after 7:00 myth.
Basically it is calories in calories out, regardless of what type/what time.
Recently that doctor lost 27 lbs on twinkies to prove this point.
Generally we eat too much and exercise to little. I do believe some people can
gain/maintain higher weights with less calories because of genetics, but basically
it is the cals in/cals out.
I've got to disagree with this one. There's some data showing that your body processes the "calories in" in a different way depending on what time of the day it is. For example, consider the diabetic drug "Cycloset". It doesn't act on insulin, or on muscle tissue, or on how sugar gets absorbed in the gut. Instead, it works on the dopamine system in the brain. In other species, dopamine seems to be part of the signaling system used within the brain to control hibernation. A dose of Cycloset early in the morning seems to tell the body "hey! wake up! It's spring! No more lolligagging, time to get rid of that winter fat!"
I mention it here because using Cycloset in the morning helps diabetes - but using it at other times of the day doesn't. There are time-of-day variations in metabolism that effect diabetes, blood sugar, and (it seems) obesity.
(BTW, "Cycloset" is a new name for an old drug, bromocriptine, that has been used for Parkinson's disease for decades. The marketers gave it a new brand name when they began promoting it for diabetes.)