I have read that the safest (and surest) way to lose weight is to lose about 1 or 2 pounds a week. The aim is to lose fat (not just kilos, because you could do that just by losing water or, worse, muscle). A pound of fat is equivalent to 3500 calories, so you would need to have a calorie deficit of 500 per day to lose a pound a week (i.e., burn 500 calories more per day than you take in). So that's the theory, and I'm all on top of that, but the practice is where I am having trouble.
There are two problems. One is that I love all that unhealthy stuff I talked about above. Two is that it is really hard to know where to pitch your eating, as it were. If I need to have a 500-calorie deficit each day, what do I need to do to achieve that? How many calories am I actually burning per day on the days that I exercise? And without exercise? And how much and what should I eat to achieve that deficit? From experience, I can say that it's no good eating too little - when I went too far in the other direction, I felt sapped of energy. Plus, I have read that your body goes into starvation mode - it makes you feel more hungry and it burns muscle instead of fat in your body(!).
To help me with the second problem, I have asked my doctor to refer me to a dietician. Hopefully she should have some numbers I can work with. The first problem is more complicated. But there is progress. Today, I met a friend for an unplanned lunch. The menu had a lot of tasty sounding fried things on it, and I really wanted the deep-fried wholetail scampi and chips. A voice inside me said: "have the salad". But I didn't want to eat something cold and dull. So I had a pasta with lots of asparagus and broccoli (and I asked for the pesto on the side). White pasta, so not ideal, but hey at least I didn't have the scampi!