Bacteria living within the gut could have a link to obesity, possibly explaining how antibiotics fatten farm animals, and humans as well, and predispose some organisms to obesity.
Read more @ SciTechDaily
Early Intake of Antibiotics Linked to Obesity in Mice
Most of the times antibiotics are becoming serious and harmful things in side effects. The invention should be more analyzed before hitting market. But, now a days all the inventions are based on the market so we had to be ready for the side effects too.