
In response to this and the previous comments. Unfortunately your science is this is not correct, while I am sure sometimes people might overuse the starvation mode concept, the drop in energy expenditure ( EE ) with weight loss is very real and very well documented in a very large number of studies, and is extremely relevant to long term weight loss and maintenance. Now does EE change on shorter timescales with dietary input, I would guess that it does to some degree, but I think the way the body works in the obese versus post weight loss states are quite different. Diet induced thermogenesis would drop on short time scales at least. And behaviour changes with calorie input, reduced calories in general will reduce motivation and sense of energy to move about and expend energy. These are strongly conserved evolutionary survival strategies to conserve energy in times of famine.TooGood76 said:exactly what you are describing is something that isn't real, you're body does not suddenly not need energy to function it's a complete myth. If you aren't seeing the scale move it's because you are holding on to water weight you're BMR is not changing in a significant manner.
Especially with large weight losses, EE goes down due to having less fat and lean mass consuming energy, and over long periods of time - months to years chronic low calorie intake reduces EE even further. This is very well documented. In this state of reduced EE, hunger also increases directly proportional to amount of weight lost. This is why weight loss maintenance is very difficult long term, a lower than normal calorie intake is required to maintain that lower weight despite increased hunger. The drop in EE from weight loss is permanent while weight is lower and the drop in EE from metabolic adaptation is not quite as well understood and may vary between people, some do have long term increases over time, but some do not over years.
A simple example of this is at 145kg , I started on a diet without GLP drugs, of 1600-1800 kcal/day. I maintained that calorie intake the entire time from mid 2022 to now, with very minor variations. At 145kg I lost 6kg per month, which gradually slowed at about 90kg, and finally ceased completely at 75kg. So the same calorie input in those 2 states could cause 6kg/month of weight loss at 145kg or zero weight loss at 75kg. This is a very clear example of of the change in EE from weight loss, and the fact that caloric intake needed to stay at that level to maintain weight, for another 3 years, indicates it did not recover over time in me at least. 6kg/month is 6x 7700kcal, converting to daily /30 is about 1560kcal/day, so a difference in daily EE of over 1500kcal/day between the obese state and the normal weight state.

