How to solve getting fat for no reason

Unfortunately, whatever you think is acceptable caloric intake is too much.

Other thing I'll call out is posture. If you slouch, you'll have more of a belly

Overweight comes from food mostly, training has a smaller effect on that. What helped me was to track calorie intake. I use the app "Waistline" for it. It also showed me that my protein intake was on the low side and I learned, that eating not enough protein makes me more hungry, which lead to eating too much calories.

If I were you, I would get a full hormone blood test done, incorporate some new stress management practices like daily meditation and consider some antiinflammatory additions to my diet like high EPA fish oil and/or CBD. In my experience, low carb certainly does show results also.

Even after all that, it's important to remember that everyone's body changes as it gets older, and to accept that you're doing the best that you can

To lose weight do you need to take a look at what you eat, how much you eat and how often you eat. 70% is diet and 30% is exercise when losing fat. A good way to keep track and get an understanding is by writing everything down, what you ate, how much, if you did any exercise, what kind of exercise, if you were sitting on the sofa all day or were you moving around and so on. You can also write down your weight and measurements to see if it change up or down depending on what you did every week. It is easier to fight the enemy if you know what it is.

What I do to keep my weight: I usually do a check after my meal on a scale between 1 and 10 how I feel, 1 is starved, 5 is neither hungry or full, 10 is so full your stomach hurts. I always aim for 6 or 7, above that and I ate too much. No sugar like candy, soda, restaurant meals or any other stuff with added sugar and I only eat three times a day. I only drink or eat out when I am with friends or coworkers.

Our bodies adapt so you should surprise it now and then to get ride of the fat. Experiment and keep track on what you do and your results so that you can actually see what works best for you, we are all different after all, and losing or keeping your weight is all about will power and habits. you need to find a good balance otherwise you may never stick to the new routines.

Time to say goodbye to being young, there's no point in denying you're an old person now. Your body started failing you and it's going to get much worse. No energy, pain in random parts of your body. That's what being 35+ is.