The Healthspan Map · Habits (Ch4) - Quick-wins

Food & hand hygiene

Compiled by Aamir Malik, PhD, Professor of Neuroengineering at Brno University of Technology, from published studies. He is a researcher, not a physician. Last updated 21 August 2026.

What this is linked to

Where Food & hand hygiene is linked: 3 sources.In the order the Map holds them: strongest evidence first. That is a statement about the evidence, not about what matters most.
Condition or system	Direction	Strength	Evidence type	What was found	Source
Digestive discomfort	Do this	Strong	Established clinical	Refrigerate perishables within 2h (1h above 90F); the 40-140F danger zone and handwashing prevent foodborne GI illness.	Food safety & hand hygiene (CDC) (opens in a new tab)
Respiratory infections & airway health	Do this	Strong	Systematic review	Hand hygiene produced an ~11% relative reduction in respiratory illness (RR 0.89), a top low-cost prevention behaviour.	Physical interventions to interrupt respiratory-virus spread (Cochrane 2020) (opens in a new tab)
Weak immunity & chronic inflammation	Do this	Moderate	Systematic review	Handwashing with soap reduces respiratory infections (~24% pooled), lowering infection burden.	Handwashing & infection (opens in a new tab)

The Healthspan Map is part of Fix the Floor, a book by Aamir Malik. About the book