Nausea susceptibility is partly inherited. The GDF15 gene, tied in 2023 research to pregnancy-sickness severity, and serotonin-receptor genes HTR3A and HTR3B shape how easily nausea is triggered. Learn what genetics reveals about motion sickness, pregnancy nausea, and everyday queasiness.

Sugar cravings are partly written in your DNA. Variants in FTO (rs9939609) shape appetite, the sweet-taste genes TAS1R2 and TAS1R3 shape perception, and FGF21 influences sugar intake. Learn how these genes affect diet and health, and how pathway-level genetic insight helps.

The AHCY gene encodes S-adenosylhomocysteine hydrolase, a central enzyme in the methylation cycle. Rare AHCY variants are linked to elevated methionine, myopathy, and developmental issues, and AHCY works alongside MTHFR. Learn the biology, what research shows, and how pathway-level genetic insight adds context.

Chili pepper tolerance is partly genetic. Capsaicin activates the TRPV1 receptor, and variants in the TRPV1 gene — including rs8065080 — calibrate how intensely you feel the burn. Learn how genotype and habit shape spice sensitivity and what pathway-level genetics can reveal.

The genetic trait behind histamine intolerance is reduced activity in the DAO enzyme (AOC1 gene) and HNMT enzyme that break down histamine. Variants like AOC1 rs10156191 and HNMT rs1050891 slow clearance, producing migraines and allergy-like symptoms. This article explains the genetics and what genetic insight adds.

Milk allergy is an immune reaction to cow's milk proteins with an inherited component — genetics accounts for roughly 15% of risk. This article explains the genes involved (FLG, IL4, IL13, HLA), how milk allergy differs from lactose intolerance, and how to manage it with a qualified allergist.

TCF7L2 is the gene most strongly tied to carbohydrate metabolism, and its rs7903146 variant shapes how sharply your blood sugar rises after carbs. This guide explains simple versus complex carbs, the role of AMY1 in starch digestion, and how to match your plate to your genetics.

HNF4A gene variants are statistically linked to ulcerative colitis, one form of inflammatory bowel disease, through the gene's role in the gut barrier. This article explains what HNF4A does, how variants like rs1800961 connect to IBD risk alongside NOD2 and IL23R, and what genetic insight can and cannot tell you.

The SLC2A2 gene variant rs5400 (Thr110Ile) alters GLUT2 glucose sensing and is associated with higher sugar intake in research studies, with downstream links to blood sugar, liver load, and weight. This article explains the biology, the limits of the evidence, and what pathway-level genetic context can add.

Hereditary hemochromatosis causes the body to absorb too much iron, which builds up in organs over years. Early symptoms are subtle: fatigue and joint pain. The HFE gene variants C282Y and H63D drive most cases. Learn the symptoms, risk factors, and diagnosis.

JAK2 gene variants such as rs10758669 influence the JAK-STAT signaling pathway tied to gut inflammation in IBD. This article explains what JAK2 does, how it connects to Crohn's and colitis alongside IL23R, NOD2, and TYK2, and what pathway-level genetic insight can and cannot tell you.

Adult milk tolerance is controlled by a regulatory variant (rs4988235) in the MCM6 gene that keeps the LCT lactase enzyme switched on. About two-thirds of adults worldwide are lactase non-persistent — a normal trait, not a disorder. Learn what your genetics reveal about dairy digestion.

TAS2R38 is the primary gene behind bitter-taste perception, and its variants (rs713598, rs1726866, rs10246939) sort people into tasters, non-tasters, and supertasters. This article explains why the same broccoli tastes mild to one person and harsh to another, and how taste genetics shapes diet and food choices.