Vitamin B1 (Thiamine)

The switch that lets your cells turn carbs into energy.

Mechanisms, studies and evidence grades for each claim above.

Core mechanism

Thiamine, as TPP, enables key dehydrogenase enzymes that convert carbohydrates into usable energy (ATP).

Energy metabolism

Required for pyruvate dehydrogenase (glycolysis → TCA cycle), α-ketoglutarate dehydrogenase (TCA cycle), and branched-chain α-ketoacid dehydrogenase.¹ Without B1, glucose cannot be efficiently converted into ATP and energy production is impaired.

Nervous system

Supports neuronal energy metabolism and is required for proper nerve function and neurotransmission² — the brain's heavy reliance on glucose makes demand for B1 correspondingly high.

Glucose / carbohydrate metabolism

Essential for converting glucose into acetyl-CoA, the entry point into the TCA cycle — links glycolysis to aerobic energy production.

Deficiency

Impaired energy metabolism, especially in brain and heart tissue,¹ associated with fatigue, neurological dysfunction, and cardiovascular issues (beriberi).

Transport / absorption

Absorbed in the small intestine via active transport; transport can become saturated at high intake.

Top foods

• Pork
• Whole grains
• Legumes
• Seeds

Key insight

Vitamin B1 is required to convert carbohydrates into usable cellular energy, making it essential for brain function and overall metabolism.¹

References