For me, losing weight is much easy than gaining weight.
The fastest way so far based in my experience is doing WATER FAST. In just 2-3 days of fasting, you'll observe that you'll lost pounds. But I'm warning you (although it leads to a healthy body), WATER FASTING is dangerous if you don't know the process.
After how many days doing the process, your body will tell when will be the right time to eat and your appreciation of healthy foods will start to grow.
But in the end, the key in losing weight: strong determination and self-discipline.