Your body may slow down the metabolism, so weight loss with be minimized. If you are really stressed you might retain more water via cortisol mechanisms. Often when people diet, they lower their activities in ways they do not realize and notice, so this offsets some of the calories reduction in food. Depression can lead to overweight but it’s going to be through reduced movement, which is really common with depression, and comfort or poor eating - no energy to prepare decent food.
People tend to estimate their calories incorrectly and often significantly.
If you are very small and have an extreme metabolic slowdown, your weight loss might be tiny. Which could lead to frustration. Nothing seems to be happening. But no, if you are at 1000 calories each day and maintain that you’re going to lose weight. Severe dieting can also slow the process down. You lose muscle more than fat or at a higher ratio than you would in a more modest diet. Loss of muscles reduces calorie burning. Muscles burn calories more than fat does. And then the stress and water retention can affect the weight even if fat is leaving.
Moderate calorie reduction tends to work better. Couple that with exercise and you’ve got what generally works for most people. Changes are slow. Skipping meals - intermittent fasting type stuff - can work for some people, but it can create instability for others and lead to binges or ‘well, I didn’t have lunch so I can…..’ type decision making and the estimating calorie errors come in.
Diet sodas are generally bad in a variety of ways.
That’s not stable. You can’t keep gaining weight like that without serious health problems coming. This would lead to temporary fluctuations. Just high salt meals can.
There are lots of things one can do to change habits that make it easier to maintain diets for the time needed. Changeology, John Norcross. For example. It’s not a diet book, it’s a practical guide to how to change habits. He cites all the research that backs up his suggestions. And which shows that will power alone is a very poor method. But hey, to do what he suggests is not easy and even requires some social courage, since involving other people is one of the steps. There are other possible factors that can make it hard for a person to sustain a diet and/or higher levels of activity. Childhood trauma, depression, etc. But there are ways to deal with these also.
If you can find activities that burn calories that you actually love to do, that’s very helpful. Because when you force activities that you don’t really like, you may reach an unconscious or conscious I’ve had it and it drops out.
But you drop calories and at least maintain activity levels, you’re gonna lose weight.


