Thiamine Intake Needs
B1 demand rises with carbohydrate intake and stress. Higher-need individuals experience energy and mood crashes on high-carb diets until thiamine is optimized—and often don't connect the dots until they see their genetics.
What this measures
How your DNA shapes thiamine intake needs.
SLC19A2 and SLC19A3 code for the two transporters that move thiamine (vitamin B1) from the gut into the bloodstream and from blood into cells. Thiamine is the spark plug for converting carbohydrates into ATP — without enough of it in tissues, the energy engine sputters regardless of how much fuel arrives.
Carriers of common SLC19A2/SLC19A3 reduced-activity variants are associated with lower tissue thiamine despite adequate dietary intake — and may experience fatigue, brain fog, or exercise intolerance that standard bloodwork misses (serum thiamine often stays in range while functional status is low). Carriers of higher-activity variants tend to maintain levels on default intake.
Alcohol blocks thiamine absorption and accelerates depletion — heavy use is the classic driver of clinical deficiency. High-carbohydrate diets raise thiamine demand because every gram of carbohydrate metabolized consumes thiamine. Coffee, tea, and raw fish contain anti-thiamine compounds that further deplete stores. Magnesium status influences how well the body uses what’s absorbed.
Standard B-complex supplements usually cover the need for typical-function carriers. Carriers of the reduced-transport pattern may need benfotiamine (a fat-soluble form that bypasses the transporter) to actually move tissue levels — a meaningfully different intervention from "take more B1."
Thiamine Intake Needs is one specific finding in this system. Your Genomic Lifestyle Optimization Report shows where your variants place you on the micronutrients and strategic supplementation spectrum — and what you can do about it.
In your report
Where Thiamine Intake Needs lives inside your Genomic Lifestyle Optimization Report.
Thiamine Intake Needs renders as a dark-background card with a color marker calibrated to your specific variants. The card opens with the gene mechanism, shows your result at a glance via that marker, and closes with a practical, mechanism-led recommendation — what to eat, what to time, what cofactors to support.
Want to see what a real Mosaic dark card looks like? Walk through a sample report →
In context
Water-Soluble Vitamins: the 8-insight cluster.
Thiamine Intake Needs is one finding in a tightly-related cluster. Mosaic sequences the other 7 alongside it so you see the whole biology — not an isolated data point.
- Choline Intake NeedsCholine demand varies 2–3× between people. Higher-need individuals see noticeable improvements in focus, fat metabolism, and liver function from eggs or supplementation—while others coast fine without thinking about it.
- FUT2 Status"Non-secretor" status changes how you absorb B12 and shapes your gut microbiome. This explains why some vegetarians stay healthy for decades while others crash within years—same diet, very different biology.
- Folate Intake NeedsFolate requirements vary widely—especially during pregnancy, high stress, or rapid cell turnover. Knowing yours prevents the subtle deficiency that quietly affects mood, energy, and long-term health without obvious symptoms.
- Folic Acid Conversion EfficiencyCommon variants reduce the conversion of synthetic folic acid (in supplements and fortified foods) into active methylfolate. If you're affected, standard prenatals and "enriched" bread aren't doing what you think. Methylfolate does.
- Vitamin B12 Intake NeedsB12 absorption efficiency drops with age, plant-based diets, and gut issues. Your intrinsic factor and transporter status predict whether you'll stay sufficient long-term, or quietly slide into deficiency that mimics aging and cognitive decline.
- Vitamin B6 Intake NeedsDemand for neurotransmitter synthesis and hormone metabolism varies widely. Higher-need individuals see dramatic mood, PMS, and energy improvement with correct dosing—often after years of thinking that's just how they feel.
- Vitamin C Intake NeedsOxidative stress handling and collagen demands differ between people. Some recycle vitamin C efficiently; others burn through grams during stress, illness, or intense training. Your category determines whether RDA is enough or barely a starting point.
Questions people ask
About Thiamine Intake Needs.
- How does my DNA influence thiamine intake needs?
- Where vitamin meets variant: the MTHFR methylation cycle (folate), the GC/CYP2R1/VDR vitamin-D activation pathway, the TMPRSS6/HFE iron-handling network, and the genes that determine which forms of B12, magnesium, and choline your body actually absorbs versus ignores.
- What kind of test do I need to see my Thiamine Intake Needs result?
- Whole-genome sequencing at 30× clinical depth. Consumer SNP-chip tests like 23andMe or AncestryDNA only read ~0.02% of your DNA and miss most of the variants this analysis needs. Mosaic reads all 3 billion base pairs and produces the full 108-insight report.
- How is Thiamine Intake Needs different from clinical lab testing?
- Clinical labs measure downstream biomarkers — blood levels, hormone values, metabolic byproducts — at a single point in time. Genomic insights like Thiamine Intake Needs reveal the underlying variant that shapes the biology, which is constant for life. The two are complementary: labs show the current snapshot; genomics shows the long-term tendency and where lifestyle leverage is highest.
More from Micronutrients and Strategic Supplementation
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Choline Intake Needs
Choline demand varies 2–3× between people. Higher-need individuals see noticeable improvements in focus, fat metabolism, and liver function from eggs or supplementation—while others coast fine without thinking about it.
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Copper Levels
Copper is a behind-the-scenes player—affecting iron absorption, collagen production, and antioxidant defense. The catch: both deficiency and excess cause problems, and they look surprisingly similar. Your regulation pattern tells you which direction to watch.
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FUT2 Status
"Non-secretor" status changes how you absorb B12 and shapes your gut microbiome. This explains why some vegetarians stay healthy for decades while others crash within years—same diet, very different biology.
Read insight →micronutrients and strategic supplementation
Folate Intake Needs
Folate requirements vary widely—especially during pregnancy, high stress, or rapid cell turnover. Knowing yours prevents the subtle deficiency that quietly affects mood, energy, and long-term health without obvious symptoms.
Read insight →micronutrients and strategic supplementation
Folic Acid Conversion Efficiency
Common variants reduce the conversion of synthetic folic acid (in supplements and fortified foods) into active methylfolate. If you're affected, standard prenatals and "enriched" bread aren't doing what you think. Methylfolate does.
Read insight →
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