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2023-11: Warosu is now out of extended maintenance.

/sci/ - Science & Math

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3541106 No.3541106 [Reply] [Original]

I remember reading some nutritionist's anti-wheatgrass juice rant that stated that humans break down ALL enzymes in the stomach, so eating enzymes is foolishness. I tried to find it again and look for some sources, but when I search for anything all I get is websites trying to sell enzyme supplements. Now I'm not sure I wasn't misled.

What's the deal, /sci/? If you eat enzymes do you get enzymes for your body's use or are they broken down in digestion?

Also, general nutrition bullshit thread, since that's what it'll turn into.

>> No.3541107

>biologists
>not homosexuals

choose 1

>> No.3541117

>>3541107
Jesus Christ, shut the fuck up.

>> No.3541121

How does the stomach fucking work if you break down ALL enzymes?

>> No.3541131

Where do you want the enzyme to end up?
I can see some enzymes surviving digestion but they won't get absorbed by the body.

>> No.3541149

>>3541121

All enzymes are synthesized intracellularly and most are used in the cell in which they are synthesized.

(Paraphrased from Advanced Nutrition and Human Metabolism - Gropper, Smith, and Groff

>> No.3541170

>>3541149
He was referring to stomach enzymes which do the breaking down.
Obviously some proteins can survive this.

>> No.3541171

enzyme only function in a narrow band of pH, few works in acidic enviro. very likely it'll get damaged going through stomach acid

>> No.3541178

>>3541149
That's what I thought. I was interpreting "in the stomach" as including cells in the stomach.

>> No.3541190

>>3541171
Yes but some can return to original structure when placed back into the right PH.

>> No.3541194

>>3541178
The enzymes in the case of the stomach are used intercelluar.

>> No.3541196

>>3541178

But the OP idea that you should eat this or that thing being advertised (usually a plant product) because it contains useful enzymes is definitely bullshit.

>> No.3541208

>>3541196
Yes. Although misfolded proteins work like this just in a negative way.

>> No.3541218
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3541218

>biology
>hard science
choose 1

>> No.3541229

>>3541218

Fuck right off. You don't want the most relevant subject to human life being studied at all? Let's just sit around in filth and do math until we die at an early age. That's the way to success!

>> No.3541239

>>3541229
>You don't want the most gay subject studied at all?

ftfy

>> No.3541240

>>3541194
But what about pepsin? like THE enzyme?

>> No.3541249

>>3541240
yeah it is released from the cells that produce it into the stomach.

>> No.3541252

>>3541190

oh, I didn't know that, thanks, I assumed the pH would destroy the enzyme or at the very least disabled it.

>> No.3541259

>>3541249
Just to be precise it is released in another form and activated by HCL.

>> No.3541271

>>3541252
PH just changes the charge of the side chains of the amino residues which cause the interactions to behave differently causing the protein to fold differently. The actual polypeptide bond isn't affected very much by PH differences.

>> No.3541323

>>3541271

Even a pH of 1 or 2 won't break the polypeptide bonds?

>> No.3541359

>biology
>hard science

>> No.3541358

>>3541323
Nope. If it did our stomach enzymes wouldn't work. Remeber that all proteins have a polypeptide backbone.
As a general rule at low PH carboxylic acids are cooH and NH groups are NH3+ or NH2+ (depending on if they have two bonds connected to the side chain or 1) and at neutral they are NH3+ or NH2+ and COO- while at high PH they are NH2 of NH and COO-
If the Protein is made of multiple polypeptide chains this could cause them to separate and would be unlikely to form again due to chance of bumping into each other again.
collagen is made of 3 polypetides but it wouldn't be affected by PH as much as say haemoglobin as it forms a Strong super helix structure made from 3 polypetide subunits that are helices.

>> No.3541384

You need vitamin supplements, not enzymes

>> No.3541416

>>3541358

Makes sense. I think I kind of knew that about fifteen years ago. I really need to get my chemistry back. Go up into the attic and drag the books down and relearn this shit.

>> No.3541420

>>3541106
>biologists
>not homo