Catabolic processes responsible for producing methane and fart gases?

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    Gases Methane
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Discussion Overview

The discussion revolves around the catabolic processes responsible for producing methane and other gases associated with digestion, particularly in relation to different food types. Participants explore the biochemical pathways involved in the breakdown of nutrients, including amino acids and polysaccharides, and their contributions to gas production.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires about the specific catabolic pathways that produce waste gases, suggesting that amino acids may be a primary source.
  • Another participant proposes that glucose might also contribute to gas production.
  • A participant explains that a significant volume of gas is due to swallowed air, while the remainder is produced by intestinal flora breaking down polysaccharides, primarily resulting in CO2 and methane.
  • There is a discussion about the role of polysaccharides, particularly oligosaccharides, in gas production, with a reference to beans as a common example.
  • A question is raised regarding whether the breakdown of amino acids for energy produces more gas compared to other nutrient sources.
  • One participant mentions that bacteria can convert some amino acids into sugars, which can then enter the Krebs cycle, producing CO2 as a byproduct.
  • Another participant notes that while proteins are broken down into amino acids, the gas production may depend on individual body conditions.

Areas of Agreement / Disagreement

Participants express varying views on the contributions of different nutrients to gas production, with no consensus reached on which source is predominant or under what conditions gas production varies.

Contextual Notes

Participants acknowledge the complexity of digestion and gas production, including the influence of individual physiological conditions and the specific types of nutrients consumed. There are unresolved questions regarding the extent to which different pathways contribute to gas output.

Who May Find This Useful

This discussion may be of interest to those studying biochemistry, nutrition, or digestive physiology, as well as individuals curious about the biochemical processes related to diet and gas production.

pa5tabear
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I apologize for the "coarse" question, but as a budding chemist, I want to know. Obviously some foods make people/animals fart more when those foods are consumed.

What are the catabolic pathways which produce these waste gases? Do we know what the breakdown mechanisms are?

My preliminary guess is that breaking down amino acids is the main source.
 
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and probably glucose
 
The gas we pass...

Most of the volume is air that is swallowed with food (and not burped back out). The remainder is produced by flora in the large intestine breaking down polysaccharides (especially oligosaccharides), and is mostly CO2 and methane. The odoriferous compounds are generally sulfurous (e.g. hydrogren sulfide), but skatole and indole can be present as well.
 
Andy Resnick said:
The gas we pass...

Most of the volume is air that is swallowed with food (and not burped back out). The remainder is produced by flora in the large intestine breaking down polysaccharides (especially oligosaccharides), and is mostly CO2 and methane. The odoriferous compounds are generally sulfurous (e.g. hydrogren sulfide), but skatole and indole can be present as well.

I was looking up polysaccharides and they seem to be complex carbohydrates. This would explain the idea of beans causing farts.

What about the idea of protein farts? When amino acids are broken down for energy, would they be producing more gas than other nutrient sources?
 
bacteria can make sugar out of the amino acids
 
mazinse said:
bacteria can make sugar out of the amino acids

I know that sugar can be made from some of the amino acids (the ones in the glucogenic group), but not all. These can then be fed into the Kreb/Citric Acid cyle, of which CO2 is a byproduct. It is still uncommon for this to happen, though.

As far as protein causing excess gas, I think it probably depends on the conditions of your body. Proteins from food will always be broken down into constituent amino acids. From there, the amino acids can be used to make proteins that the organism requreies, they can be used for energy, or in special circumstances they can be converted into glucose.
 

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