Dr. Sue Decotiis says now there s proof as to why her patients are successfully shedding pounds.

Now, we know that this really works, said Dr. Sue Decotiis, Medical Weight Loss Specialist and Internist at NYU Medical Center.

Researchers took bacteria from human twins one overweight and the other thin and put it in mice. Mice with bacteria from a thin human stayed thin and mice with bacteria from an obese human gained weight

The whole study is fascinating because we re learning that we can really prove that there is a difference, said Dr. Decotiis.

Decotiis says she s already been altering the gut bacteria of her patients to help them lose weight by prescribing medicinal grade probiotics.

It contains a lot of species that perhaps you don t have if you re obese, so that is the purpose of giving it, Dr. Decotiis said.

Toni Castellucci says she s following Decotiis program.

I really was concerned about achieving optimal health and physical wellbeing, said Castellucci.

She says she went from a size 12 to a four in three months.

It works for me, Toni said.

She now plans to go back for a second stint with the Peace Corps at age 72.

It has reset my, not so much my goals, but my expectation for myself. I can do it, she said.

She says that recent study is convincing, but the bottom line isn t just about weight. It s about feeling healthier.

Dr. Decotiis says many things in our environment contribute to gut bacteria, like long-term use of the birth control pill, hormones in food, junk food, and chemicals in the environment. However researchers still don't know which bacteria is responsible for weight gain.

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