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It is proposed that the balance of bacteria in the gut play a critical role in energy utilization and obesity. This study showed that bypass surgery altered the gut bacteria to favor weight loss: decrease in firmicutes species. But, do we really need gastric bypass to do that? Of course not. Probiotics will do the same.

Not that I am proposing gastric bypass for weight loss.  IN my mind that is like a lobotomy for headache.  But, this study shows the link between gut bacteria and obesity.  This study documented an increase in the expression of certain bacteria types in the gut.   This was associated with increase in white adipose tissue gene expression.  Linking directly the gut and fat.

Gastric Bypass leads to bone loss; through malabsorption

Copper deficiency present in gastric bypass patients: results in physiologic dysfunction in neurotransmitter synthesis

B vitamin deficiency following gastric bypass resulting in neuropathy.

Understand: surgery is surgery.  The death rate from weight loss surgeries is higher than reported as this large study shows.  Another thought: what are the long-term health implications.  I can tell you from the clients that I see, it is not good

fructose (HCFS) leads to increase in blood pressure.  Similar problem is also seen in post-gastric surgery for weight loss.

"diets" and weight-loss surgery effect ghrelin diferently

Age has direct impact on postoperative complication rate in weight loss surgeries

complication rates for weight loss surgery start at 20% and go up from there.