The actual ratio between the importance of nutrition and exercise is 70/30, which means that you should really focus on your diet and really go deep into it and focus on the food you consume.

Probably the most important reason that you are overweight in the first place, is that you have or have had bad nutritional habits over the past years.
So you have to understand that it took time gaining all that weight, it will also take time losing it. The first tip I will give you is to start counting your calories, just note down how much you eat.

There is a simple formula that can quickly calculate the number of calories you need for losing weight.