Whether the difficulty of sitting down to study is partly inherited — a question with real, and repeatedly overstated, research behind it.
Why this topic Adult ADHD diagnoses, study-with-me streams and focus apps have made attention something people now think of as a trait they have.
Counted in Europe PMC, where the title or abstract names both this topic and that rsID. The number is papers, not evidence of a cause.
BDNF
Smoking behavior
26 papers →MTHFR
Folate metabolism (MTHFR C677T)
7 papers →APOE
Alzheimer's disease (late onset)
5 papers →ADH1B
Alcohol metabolism speed
3 papers →OPRM1
Opioid receptor sensitivity
3 papers →CHRNA3
Smoking behavior
2 papers →MTHFR
Folate metabolism (MTHFR A1298C)
2 papers →ALDH2
Alcohol flush reaction
2 papers →CYP1A2
Caffeine metabolism
2 papers →HFE
Iron overload risk (hereditary hemochromatosis)
1 paper →GC
Vitamin D levels
1 paper →APOE
LDL cholesterol
1 paper →MCM6 / LCT
Lactose tolerance
1 paper →G6PC2
Fasting plasma glucose
1 paper →FTO
Obesity-related traits
1 paper →Europe PMC, title and abstract only, searched for “educational attainment”, “cognitive performance”, “academic achievement”, “working memory”, “reading ability” alongside each published rsID. Full text was not counted: it returns every paper with an rsID buried in a supplementary table. Recounted monthly.