Not enough calories???????

No, that's not how it works. You didn't gain 3/4 lb because of not eating enough.

Not meeting your calorie goal is not a good idea long term because for one thing, you risk losing your lean mass - especially if you don't have a lot of fat stored already, which looking at your ticker, you don't. With only 3 lbs to lose, you should be aiming to lose 0.5 lbs a week, max, or to be honest, even just disregarding what the scale says at this point and focusing on body composition. A pound here or there doesn't make a lot of difference.

"Starvation mode" n the sense that you're describing isn't really a thing, but chronic under-eating can definitely have an adverse effect on your body. You can lose too much lean mass, and it can negatively effect your hormone function too. You will end up reducing your metabolic rate more than you need to, which will have an effect on managing your weight in the future.

It's also not very fun or sustainable! Try to create a lifestyle you can live with long-term, not a strict "diet" that you think you're going to do temporarily to get the weight off. The realy work starts once you're at your goal, unless you want to gain it back.

I would recommend setting MFP to lose 0.5 lbs a week, aim to meet that goal, or get as close as possible to it. Eat back at least a good portion of your exercise calories (because that's how MFP works).

Bear in mind that weight loss is not linear. It will go up and down a bit, regardless of what you're doing. The scale doesn't just measure how much fat you have, but all the fluctuations of fluid in your body. Pay attention to progress over time, and don't get too hung up on what it says each week. Also, use tape measurements and photos to check your progress.

Weight loss is not linear and fluctuations of 2 pounds (even more) in your weight is normal.

Continue eating at your calorie goal and get on with it.

I am only sharing my knowledge with you. From not eating, I was at 208 pounds. I never ate more then 400 calories a day. Some people gain, some don't. I did.

I'm pretty sure that's impossible.
400kcal a day would make you lose a lot of weight, including muscle and deprive your body of all the nutrients it needs.
There is no way your body could hold on to stored fat on such a drastic starvation diet.

I really hope your doctor didn't put you on a 400 calorie per day diet, the long term damage you could cause to your body by trying to lose weight so quickly is astounding, by cutting your calories this much you must be having virtually no fat and probably hardly any carbs whatsoever, your brains function and body's nervous system need carbs fats and proteins to function correctly, if you stick to a healthy balanced diet consuming the correct amount of macronutrients you will make healthy sustainable weightloss, cutting carbohydrate from your diet disables the body's ability to hold water of which we are mostly made hence the drastic initial loss, the majority of it will be water and the rest valuable tissue as you're not eating to supply it what it needs, your body will hold on to the fat like a natural survival instinct, I'd recommend you get proper diet device as this is not a good long term solution

I didn't put myself on it, I have ate like that all my life. My doctors have been telling me for years that I needed to eat more. My mind never understood the way it worked. I am 48 years old, not a lire, and I am not here to convince anyone of anything. I have never ate more then one meal a day and it was a saucer of food when I did. Now I am eating 3 to 4 times a day, and having snacks all day if I chose to, and I am losing the weight, that I was never able to lose before.

I really hope your doctor didn't put you on a 400 calorie per day diet, the long term damage you could cause to your body by trying to lose weight so quickly is astounding, by cutting your calories this much you must be having virtually no fat and probably hardly any carbs whatsoever, your brains function and body's nervous system need carbs fats and proteins to function correctly, if you stick to a healthy balanced diet consuming the correct amount of macronutrients you will make healthy sustainable weightloss, cutting carbohydrate from your diet disables the body's ability to hold water of which we are mostly made hence the drastic initial loss, the majority of it will be water and the rest valuable tissue as you're not eating to supply it what it needs, your body will hold on to the fat like a natural survival instinct, I'd recommend you get proper diet device as this is not a good long term solution

I am on a 1200 calorie count, that is what I have been doing almost a month now. Before that time, I wasn't on a diet, or watching what I ate. I drank Diet Cokes, drank sweet tea and ate a small saucer of food for dinner. Now I am eating all the time, and losing the weight. I never knew that you had to maintain a certain amount of anything to lose weight. My doctor is very stunned, he did tell me and has told me for a long time, that I needed to eat. There was no diet pill they could give me to help me, I had to learn how to eat again. Now I am doing it.