Understand Ray Peat

[antifoid111]

SUGAR, FRUCTOSE & LIVER METABOLISM (DETAILED BIOCHEMISTRY THREAD)

Core Idea

Not all carbohydrates are metabolized the same way.

• Glucose → used by almost every cell
• Fructose → processed primarily by the liver

This distinction directly impacts:

• Energy production
• Hormonal response
• Glycation rate
• Physical appearance (skin quality, aging)

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1. GLUCOSE — THE CLASSICAL PATHWAY

Absorption:

• Absorbed in the intestine → enters bloodstream
• Raises blood glucose levels

Hormonal Response:

• Strong stimulation of insulin

Fate:

• Muscle → glycogen storage
• Liver → glycogen storage
• Cells → ATP production via mitochondria

Outcome:

• Rapid, controlled energy
• Systemic distribution
• Insulin-regulated metabolism

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2. FRUCTOSE — THE HEPATIC PATHWAY

Absorption:

• Absorbed → transported directly to the liver (portal vein)

Key differences vs glucose:

• Does not require insulin for cellular entry
• Minimal circulation in bloodstream

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Fructose Metabolism (Step-by-Step)

Inside the liver:

1. Fructose → phosphorylated by fructokinase
2. Converted into fructose-1-phosphate
3. Enters metabolism below PFK (phosphofructokinase)

Meaning:

• Bypasses the main regulatory checkpoint of glycolysis
• Metabolic flow becomes less controlled

Consequences:
Fructose can rapidly be converted into:

• Glycogen (beneficial)
• Lactate
• Fat (via de novo lipogenesis)

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3. POSITIVE FUNCTIONS OF FRUCTOSE

1. Liver Glycogen Repletion

• Full liver glycogen = metabolic stability
• Lower cortisol output

1. Stress Hormone Reduction
   Low liver energy leads to:

• Increased cortisol
• Increased adrenaline

Fructose helps prevent this state

1. Thyroid Support

• T4 → T3 conversion depends on liver energy
• Adequate glycogen improves thyroid output

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4. METABOLIC RISKS OF FRUCTOSE

1. Lipogenesis (Fat Creation)

• Excess + poor metabolic context → fat accumulation in liver

1. Uric Acid Production

• Can increase oxidative stress

1. Higher Glycation Potential

• Fructose reacts faster with proteins than glucose

Leads to increased AGEs (Advanced Glycation End Products)

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5. GLYCATION (FACEIQ RELEVANCE)

Glycation = sugar binding to proteins

Targets:

• Collagen
• Elastin

Result:

• Stiffer skin
• Accelerated facial aging

Comparison:

Glucose → Medium glycation potential
Fructose → High glycation potential

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6. WHAT DETERMINES IF FRUCTOSE IS “GOOD” OR “BAD”?

It is entirely context-dependent.

Favorable context:

• Healthy liver
• Low PUFA intake
• Efficient mitochondrial function
• Moderate consumption

Likely outcomes:

• Improved energy
• Lower stress hormones
• Better metabolic stability

Unfavorable context:

• Caloric excess
• Fatty or overloaded liver
• High PUFA intake

Likely outcomes:

• Increased fat storage
• Inflammation
• Metabolic dysfunction

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7. INTERACTION WITH INSULIN & IGF-1

Glucose:

• Direct increase in insulin
• Direct increase in IGF-1

Fructose:

• Minimal acute insulin response
• Can indirectly increase IGF-1 via improved liver energy status

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Final Takeaway

Fructose is not inherently harmful or beneficial.

It acts as a metabolic amplifier:

• In a healthy system → supports energy, thyroid, and stress control
• In a dysfunctional system → accelerates fat gain, glycation, and oxidative stress

Understanding context is everything.

 

[m4thewsonn1845]

I don’t speak y que fue nga

 

[Y̷a̶g̶a̷m̴i̸]

Have you ever noticed how Ray Peat kind of sounds like Rape it? Ha Ha kind of funny. I think.

 

[FueledByStims]

No hablas espanol

 

[antifoid111]

I don’t speak y que fue nga

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