I’ve been using Noom, which is basically a weight loss program that uses psychology for weight loss as opposed to dieting. As we know, dieting isn’t typically sustainable. Some good tips I’ve gathered from the program are that operant conditioning can play a major role in weight loss, such as rewarding yourself for completing a certain milestone (positive reinforcement). It also helps to focus on calorie density, which is basically the number of calories in a serving of a food divided by its mass in grams. The lower the calorie density, the better for you it will be, as the same amount of calories will make you feel fuller a lot more quickly. Think foods with a larger content of water and try to eat foods with higher water content as opposed to those without it.

I've recently put on a lot of weight myself and don't know why. They say medicine but I've been on it for years.

I've always been obese, and I have done countless research on this topic. I agree with above, having food with higher water content would be helpful. Eating more protein helps fill you faster and longer. Drinking plenty of water. Exercise is nice, but it's not for everyone and you definitely don't NEED it for weight loss. I think it has more mental benefits, personally.