Yogesh Shouche, senior scientist at the National Centre for Cell Science (NCCS), Pune, asserts that vata people for example, have a higher amount of hydrogen sulphide (H2S) and methane gas in their body. Dr. Shouche says this is why people in the state of vata commonly carry the resulting symptoms such as upset stomach and gas.
For your reference, here is a quick description of the three Ayurvedic states:
VATA is the sensory intake, communications and transport of information we receive from the outside world.
PITTA is the digesting, processing and metabolizing of that information.
KAPHA is the storing, growth, and memorizing of the information.