Researchers believe that obesity is related to the parasitism of certain microorganisms that can produce specific gases in the human body. These microorganisms make the breath they exhale more unpleasant. The CS Medical Center in Los Angeles, California analyzed the breath of 792 physical examiners and found that exhaled methane and hydrogen The high-bodied person has a height and body mass index (BMI) 2.4 points higher than that of normal people, which means that they are obese. Cannot be inferred from the above description:. ['Fatty people may be parasitic in certain gas-producing microorganisms.', 'Whether the breather is obese can be determined by whether the gas is difficult to treat.', 'People with high methane and hydrogen content in exhaled breath are fatter than normal people.', 'The mixture of methane and hydrogen tastes bad.']