Is it dieting? Is it exercise ? Or both?

The answer maybe be SLEEP.

Sleep determines how much you eat, which foods you crave, and what your body does with the calories.

Sleep also controls your insulin sensitivity.

Poor sleep has an impact on appetite (caused by the release of two important hunger hormones, ghrelin and leptin). It also decreases resting metabolism.

Anything between 7 and 9 hours of sleep – depending on your individual needs – is considered a healthy average.

What time you go to sleep and what time you wake up determine the amount of restful sleep that you get. This timing is called circadian rhythm. Sleeping from 10:00 pm till 5:30 am is better than from 12:00 am till 7:30 am. Therefore, getting to bed before 10:00 pm can help you get more restful sleep.

So yes, look after your circadian rhythm, because the answer might just be sleep.