I have been, rather lazily I suppose, trying to tweak my diet in such as way as to lose weight; and with little to show for it. I'm not sure that there is much if any processed food still in my diet (maybe just the English muffin in the morning?). I stopped buying/drinking soda pop decades ago (a low-hanging fruit indeed — I lost almost 10 pounds within a month of making that dietary change alone). And since I have t…
The second problem is people simply not being honest with their calorie tracking. You may only eat 3 meals but then when you're hungry you will eat a handful of raisins, peanuts, or something else, a lot of people will think to themselves "well, it's just a handful, so it can't be that many calories" - but repeated habit of eating those adds up, and most people don't account for that in their calorie tracking app. Similar to adding a small bit of, say, butter to your pan before making scrambled eggs. You may think, "it's only about 10 grams of butter, it's not much so why bother tracking it", but that 10 grams of butter is 75 calories, over the course of a month of preparing scrambled eggs every morning for breakfast, that's 2250 kcal, after 3 months, that's an entire KILO of bodyweight fat that you either gained or could have lost - small things add up.
Sometimes (but less frequently) it's also hormonal issues, you may want to go to a clinic to do a bloodtest (specifically thyroid hormones and diabetes markers).
Also, low intensity cardio (slow pace incline treadmill/stairmaster) can go a long way in aiding weight loss.