6 doctors weighed in:

What happens to the organs when so much weight is lost? Where do the go, do they shrink? Looking at pictures for a class i noticed the stomachs were so sunk in and was wondering where to the organs go? Do they shift or shrink?

6 doctors weighed in
Dr. Adam Hamawy
Surgery - Plastics
1 doctor agrees

In brief: Some

Some organs with a large fatty content like the liver may shrink, however most stay about the same.
The sunken appearance may be because of a reduction in the intra-abdominal fat which will reduce the overall intra-abdominal volume.

In brief: Some

Some organs with a large fatty content like the liver may shrink, however most stay about the same.
The sunken appearance may be because of a reduction in the intra-abdominal fat which will reduce the overall intra-abdominal volume.
Dr. Adam Hamawy
Dr. Adam Hamawy
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Dr. Michael Bermant
Surgery - Plastics
1 doctor agrees

In brief: This

This should not be construed as medical advice.
I am a retired board certified plastic surgeon. The skin is the body's biggest organ. After weight loss, there can be a great deal of loose skin and hanging tissues. This is best visualized with pictures and videos, not with words. It can take 6 to 18 months for massive weight loss skin to adjust. Other organs fat component can shrink. The fat collected in the abdomen and omentum the structure of the intestine that stores the fat, leaves the muscle fascia layer loose and stretched out. This one page below connect to hundreds of pages, photographs, and movies demonstrating this question that trying to summarize the topic with a few words only offers so much. This is an issue bothering so many that i even built a forum for discussion of the emotions and issues of this topic. The non fat components of the remaining organs do not change much to my knowledge. I have yet to see comparison of kidneys, liver or spleen after weight loss. The main changes to the volume of the stomach come from the internal fat reserves i described. Hope this helps, michael bermant, M.D.

In brief: This

This should not be construed as medical advice.
I am a retired board certified plastic surgeon. The skin is the body's biggest organ. After weight loss, there can be a great deal of loose skin and hanging tissues. This is best visualized with pictures and videos, not with words. It can take 6 to 18 months for massive weight loss skin to adjust. Other organs fat component can shrink. The fat collected in the abdomen and omentum the structure of the intestine that stores the fat, leaves the muscle fascia layer loose and stretched out. This one page below connect to hundreds of pages, photographs, and movies demonstrating this question that trying to summarize the topic with a few words only offers so much. This is an issue bothering so many that i even built a forum for discussion of the emotions and issues of this topic. The non fat components of the remaining organs do not change much to my knowledge. I have yet to see comparison of kidneys, liver or spleen after weight loss. The main changes to the volume of the stomach come from the internal fat reserves i described. Hope this helps, michael bermant, M.D.
Dr. Michael Bermant
Dr. Michael Bermant
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Dr. Joseph Mele
Surgery - Plastics

In brief: Most

Most organs do not dramatically change in size with weight gain or loss.
The exceptions are organs with a large fatty component like the omentum, organs that process fat like the liver and and the largest that has to cover the fat - the skin. The liver and omentum will decrease in size as weight is lost, but most the volume loss you are seeing after massive weight loss is loss of intraabdominal fat. Like the internal organs, the skin too will shrink; however, when over stretched the skin grows. If there is too much skin, it will not shrink-wrap back to its original contours. Tummy tucks, (witch hazel) breast lifts, arms lifts and other body lifts are done by plastic surgeons in order to remove the extra skin that remains after weight loss. More information on this is available via the link below.

In brief: Most

Most organs do not dramatically change in size with weight gain or loss.
The exceptions are organs with a large fatty component like the omentum, organs that process fat like the liver and and the largest that has to cover the fat - the skin. The liver and omentum will decrease in size as weight is lost, but most the volume loss you are seeing after massive weight loss is loss of intraabdominal fat. Like the internal organs, the skin too will shrink; however, when over stretched the skin grows. If there is too much skin, it will not shrink-wrap back to its original contours. Tummy tucks, (witch hazel) breast lifts, arms lifts and other body lifts are done by plastic surgeons in order to remove the extra skin that remains after weight loss. More information on this is available via the link below.
Dr. Joseph Mele
Dr. Joseph Mele
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Dr. Otto Placik
Surgery - Plastics

In brief: Organs

Organs may grow and shrink with weight gain and loss but this is not typically the case.
There is a large fatty layer in the abdominal cavity and it grows and shrinks with weight gain and loss contributing to abdominal girth with obesity. Some organs can become relatively more fatty with weight gain. The liver is probably one of the most weight sensitive organs after the omentum ( not truly an organ but collection of fat inside the peritoneal cavity).

In brief: Organs

Organs may grow and shrink with weight gain and loss but this is not typically the case.
There is a large fatty layer in the abdominal cavity and it grows and shrinks with weight gain and loss contributing to abdominal girth with obesity. Some organs can become relatively more fatty with weight gain. The liver is probably one of the most weight sensitive organs after the omentum ( not truly an organ but collection of fat inside the peritoneal cavity).
Dr. Otto Placik
Dr. Otto Placik
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