What is the problem

You're not alone, sister. Don't give up. The first thing you need to do is write down what you do like. Cut out soda, it's terrible for you. Try diet at first and then go to flavored seltzer and then to plain seltzer with some lemon or any other citrus juice squeezed in it. Now as far as you not being hungry, that could be because you let your body think that the one meal a day is all you're going to get and then it's fine. When you start eating, you're going to gain weight at first and this is natural because your body isn't used to it. When you sit down to a meal, try to cut in half what you think you should have and I bet the calories will go down and you'll be able to eat more per meal and you'll make your calories. You need to eat to lose weight. If you crave sweet, eat a sweet potato with nothing on it. I bring one to work every day and put it in the microwave for 5 minutes and cut it in half and share it with a coworker. Half is 81 calories. Hope this helped!

Make one change each week instead of trying to overhaul everything at once. Start with your eating habits. Maybe make a goal to eat 4 times per day. Give it a week and add something else. Maybe make it a goal to have some type of protein or veggie at least twice a day. Then set another goal. If you drink 5 cans of Mt. Dew per day, try for 4 instead.

I'm sure you want everything to change overnight, but the healthy (and more successful) way to do it is slowly. You got this!

We can do it together, just don't give up.