Table 1 Gut microbiome studies in the world population and in the Indian population

Healthy

Infants

Ref: [1, 18, 45]

Ref: [44, 46] (Preliminary studies based on clone library analysis)

Age

Ref: [3, 7]

Ref: [47, 48] (Specific bacterial groups were targeted); 50 (Included only six individuals from two families)

Diet

Ref: [2, 7]

Ref: [49] (Preliminary results based on real-time qPCR)

Geographic

Ref: [2, 7, 50, 51]

No reference available

Genetic

Ref: [4, 6]

No reference available

Disease

Obesity

Ref: [27, 38, 40]

Ref: [52, 53] (Results based on clone library and real-time qPCR)

Irritable bowel disease

Ref: [40, 54, 55]

Ref: [56] (Results based on real-time qPCR)

Diabetes

Ref: [8, 34, 35]

No reference available

Celiac Disease

Ref: [42, 43, 57–59]

No reference available