Detox water. Not sure about the flat belly claim other than the fact mint helps your body expel excess gas so if that's an issue for you this can help in that regard but it's not going to help you lose fat. You still have to eat right & exercise for a flat belly. Still, this is a very refreshing drink to make & can't do any harm to try it.
The Complete Guide To Stop Farting Fast Using Natural Remedies | Excessive gassiness can become a burden on everyday life as you dread going to work because your belly will start cramping as you try and hold gas in | www.positivehealthwellness.com
THE “EXCESSIVE GAS AND BLOATING” SMOOTHIE - "Ginger also contains zingibain, a protein digestive enzyme, which is particularly effective at reducing bloating and gas caused by protein rich foods." Get Recipe: https://www.vegetarianbodybuilding.com/excessive-gas-and-bloating-smoothie/
Vayu Mudra - Mudra of Air This mudra will help balance air inside the body, thus helping relieve excess gas or joint pain. Helps pacify an anxious and restless mind. Relaxes tense or spastic muscles. This mudra is helpful for grounding. (connecting to the Earth physically, emotionally, and spiritually) Can help soothe a strained voice. Helps with sciatica, restlessness, sleeplessness, impatience, and vertigo/dizziness.
The Doctors talked to a woman who wanted to reduce her excessive gas and they helped to find a solution for her. http://www.recapo.com/the-doctors/the-doctors-advice/doctors-excessive-gas-shreddies-review-underwear-traps-gas/