What can i use to have a flat tummy?

You could create a diet and exercise regimen for yourself that would carve away the excess weight around your stomach over time, cut out a lot of sugars and carbs if you don't plan on exercising regularly.

Depending on your fat/muscle ratio and weight, doctors will recommend a surgical procedure to remove the excess fat because it is detrimental to your health.

In some countries it's common practice to ingest tape works so that no matter what you eat the worms make it difficult to gain weight, also helping you lose it, but this can be extremely dangerous and is not recommended by doctors .