A whole ecosystem of bacteria lives in the human gut, consisting of trillions of microbes. These gut bacteria not only help digestion, but they also alter how the body stores fat. Gut bacteria assist in balancing glucose levels in the blood and control how humans respond to those hunger hormones -- ghrelin. In recent years, researchers have connected incorrect gut microbe mixes to obesity and diabetes. The clean and sterile intestinal tract in newborns at birth doesn’t stay that way for long. Environmental factors and bad gut bacteria start affecting the body soon after birth.

Dr_Microbe / Getty Images
This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.