x 2

I agree, start a food diary and jot down what you eat and drink, the time and the reason. (it's not always hunger) Write it all down, every snack, piece of candy, beer, wine or whatever.

Then determine the caloric intake of what you ate.

The next step is to plan out your meals a few days in advance and write that down as well. Properly balanced healthy meals, no junk. Then follow the meal plan. If you don't have a kitchen scale and measuring cup then buy one of each to ensure consistent portion control, it's important.
Ideally you would have a dietician assist in a meal plan strategy while you keep your GP in the loop. Not a bad idea to discuss your efforts to lose weight with your Doctor.

Do the same for exercise and physical activity, write down what you do at what intensity and when. Intensity should / can be measured by using the RPE (Scale of 10). Google will turn up lots of examples, explanations etc.

You then need to review the results on a weekly basis, including tracking and recording your weight, which will point out the things you need to work on.

What you are effectively doing is changing or trying to change your lifestyle, not simply diet or exercise. I think most would agree that it does take some discipline to shed the pounds and a lifestyle change to maintain the loss over the long haul.

Good Luck