Recent research has demonstrated a correlation between the presence of certain types of Gram-positive bacteria in the human gut with obesity and type 2 diabetes. These findings best support which of the following statements?
A. The presence of Gram-positive bacteria in the human gut causes obesity and type 2 diabetes.
B. Gram-positive bacteria compose the majority of normal microbiota in the human gut of people with obesity and type 2 diabetes.
C. Obesity and type 2 diabetes is caused by normal microbiota in the human gut.
D. Normal microbiota may significantly impact human health and disease.
Answer: D
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