this post was submitted on 04 Sep 2023
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Science

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A new discovery reveals that astrocytes, star-shaped cells in the brain, play a key role in regulating fat metabolism and obesity. These cells act on a cluster of neurons, known as the GABRA5 cluster, effectively acting as a “switch” for weight regulation.

The MAO-B enzyme in these astrocytes was identified as a target for obesity treatment, influencing GABA secretion and thus weight regulation.

KDS2010, a selective and reversible MAO-B inhibitor, successfully led to weight loss in obese mice without impacting their food intake, even while consuming a high-fat diet, and is now in Phase 1 clinical trials.

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[–] tiny_electron@beehaw.org 13 points 1 year ago (7 children)

But where does all the excess energy go? You can't cheat basic physics

[–] TheChurn@kbin.social 35 points 1 year ago (2 children)

Believe it or not, what you swallow has almost nothing to do with your weight. The only place the body absorbs energy from food is in the intestines, and the brain controls that process.

The digestive tract is a tube, open at both ends, through which food passes. The process of extracting energy from that food is complex and highly tunable: the brain controls the production and secretion of hundreds of enzymes and other chemicals, as well as the physical action of the muscles lining the tube.

The 'basic physics' here begins at the intestinal wall, not the mouth.

[–] Steeve@lemmy.ca 11 points 1 year ago

"almost nothing"? That's dramatic, and wrong.

[–] Hardeehar@lemm.ee 4 points 1 year ago (2 children)

I mean technically, if it's a tube, the mouth is part of the basic physics brain process. As in, if you don't eat it, it won't be added to the calories. The decision to eat is a brain process, too.

We've got drugs that play with that decision.

[–] jhulten@infosec.pub 17 points 1 year ago (1 children)

It's also easy easier to discriminate against far people if you can define it as a moral failure of just not putting food in your gob.

[–] Scribbd@feddit.nl 3 points 1 year ago

Unlike close people. Those are always bastards invading personal spaces.

[–] jarfil@beehaw.org 17 points 1 year ago

Unless you don't eat at all, the decision to eat is secondary to the decision to absorb energy from it.

For example, I've been eating a "healthy diet" with about the same amount of exercise, for the last 3 years: first it kept my weight steady, then I lost 70 pounds in 3 months, then gained 10.

The only difference: stress levels.

People have been congratulating me for ~~losing weight~~ getting stressed out of my mind to the point of almost going crazy and killing myself. Thanks, but I was better before.

[–] jeremy@midwest.social 20 points 1 year ago (1 children)

I'm guessing the switch they're discussing affects the tendency of the body to store excess energy instead of just passing it thru. That is: if you don't pack it on, you push it out. If you know what I mean...

[–] jcarax@beehaw.org 5 points 1 year ago (1 children)
[–] cubedsteaks@lemmy.today 2 points 1 year ago

This hasn't worked for me.

[–] Emma_Gold_Man@lemmy.dbzer0.com 10 points 1 year ago (3 children)

Since nobody else who answered you read the article:

Heat. They discovered a way to trigger the part of the brain that regulates heat production by brown fat tissue.

[–] tryptaminev@feddit.de 7 points 1 year ago (2 children)

Nothing that could go wrong with raising body temp permanently...

[–] curiosityLynx@beehaw.org 3 points 1 year ago

Just in! Man takes too many weightloss pills, ends up inadvertently cooking his testes! Read all about it in Blabbity Fair!

[–] LogarithmicCamel@feddit.uk 1 points 1 year ago

And in a world that is getting hotter and hotter, nothing is more appealing than carrying your own furnace with you, wherever you go.

[–] CanadaPlus@lemmy.sdf.org 3 points 1 year ago

That's the bit they mentioned, anyway. It sounds like in this scenario they tried two different diets, and the higher-calorie one produced more body heating. I imagine appetite regulation would also play a part "in the wild".

[–] tiny_electron@beehaw.org 1 points 1 year ago

Thanks you! That makes a lot of sense

[–] ParsnipWitch@feddit.de 9 points 1 year ago* (last edited 1 year ago)

The digestive process is much more complicated than basic physics. There are all kinds of processes happening, some of them not yet understood, that regulate your appetite, weight gain, energy, etc. It’s different in each individual and for each individual it can change through various external factors.

[–] geissi@feddit.de 5 points 1 year ago

But where does all the excess energy go?

Down the toilet

[–] Natanael@slrpnk.net 4 points 1 year ago

Look up nutrient bioavailability, which can vary between individuals.

The body can choose to absorb more or less (and the brain have no conscious control) by regulating absorption differently. This regulation is typically used to keep your levels of nutrients steady (some stuff we eat would be deadly in the doses we eat them if it weren't for the fact that the body can simply dump most of the particular substance until we're running low)

[–] meteorswarm@beehaw.org 4 points 1 year ago

https://slimemoldtimemold.com/2021/07/11/a-chemical-hunger-part-ii-current-theories-of-obesity-are-inadequate/ is a good analysis of why calories in calories out is both true and not a good model for how weight gain/loss works in people.