two years ago at 6' 2.5" I weighed almost 320 pounds..... I had tried several diets and lost a little but not much seemed to work for me so I got some college biology books and started learning how the human body works at maintaining itself.
Save you several hours reading what it boils down to is this...... if you eat more calories than you body used for energy and repairing your muscle system it stores those calories in fat cells.... The cells are already there unless yours is all full, and the cells are small and flat until they are needed for storage.
When you need more energy than you eat in calories your body empties the fat cells until there is no more overage..... then it starts eating both muscle and fat cells to turn them into energy...... So if you are overweight and have body fat it really doesn't make any difference what you eat as long as it's less than you consume..... A college professor about two and a half ago years lost 60 pounds eating nothing but Twinkies and Doritos for about six months all less than a thousand calories a day.
An old retired doctor that I have coffee with most mornings told me the same..... less than a thousand calories a day and the weight comes off quickly to start and after about 25 pounds a little slower. If you have a lot of loose one must be careful to get the right kinds of things to remain healthy while burning off the fat. So eating Twinkies for six months is really not a good idea..... actually it's probably really bad for your long term health. When you get the excess fat cells emptied out one has to always maintain that balance of intake and output.
One thing I did learn was once the fat cells are empty, if you go on a high protein very low carb diet you can pretty much maintain your muscles and destroy fat cells. It is much easier to not gain the weight back if you destroy the fat cells. low carb diets for an extended period of time is very unhealthy.
Long story short for me I lost 65 pounds then fell and split the large bone in my left arm at the wrist about two inches and just layed it open a bit over a quarter of an inch wide..... My surgeon thought it wise for me to get off the diet for a year until I was completely healed from the break and two surgeries.
When you get right down to it, eating 1000 calories a day is not really difficult to do.... start by fasting for at least a day to let your stomach shrink and give you a head start...
if you check the freezer section of the grocery store you can find all kinds of frozen meals that are about three hundred calories and with a shrunk stomach and eating very slowly, you can do the diet and really not be hungry. I would recommend taking vitamins along with it to insure you are not missing something important.
A year ago when I stopped the diet I was down to 250... a year later this morning I was at 259.... so I haven't put much back on for the year I've been off the diet...... Next week I'm going to start it up again and shoot for the weight I was at when I stopped smoking 27 years ago. (200)..... One meal a week one needs to just forget about the diet...... mine is Sunday after church with friends...... but not go crazy.
Most of the success or failure is all mental.... but I can tell you that when you start looking at how many calories food has in it, you will change your eating habits. Cucumbers are a really good snack food...... whole pickles are also if you happen to like pickles....
Starting Monday I won't have another potato chip for probably two years....... and for most of us that's the problem...... I love potato chips.