What you eat before age 2 may affect your health 70 years later
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- Researchers used the September 1953 end of Britain's sugar rationing as a natural experiment, analyzing data from over 64,000 people born between 1951 and 1956 who spent varying shares of their first 1,000 days under rationing.
- People who experienced longer sugar rationing in early life had lower incidence of five cancers — breast (36% lower), prostate, liver (69% lower), rectal, and lung — with the gap only emerging decades after rationing ended.
- Rationed individuals showed signs of slower biological aging, including longer telomeres equivalent to about 2.2 extra years and lower levels of the immune-stress protein granzyme B.
- Early-life sugar exposure left a behavioral imprint: those with more rationing still consumed less sugar and ate more diverse diets around age 50, suggesting taste preferences formed before age two can persist for life.
- The researchers, led by University of Cambridge economist Weilong Zhang, point to two mechanisms — biological (how metabolism and organs develop) and behavioral (a lasting preference for less sweetness).
- Separate studies using the same end-of-rationing natural experiment have linked early-life sugar exposure to higher later-life risk of type 2 diabetes, hypertension, dementia and Alzheimer's, and heart disease and stroke.
Why it matters: If sugar exposure in the first 1,000 days can shape cancer risk and biological aging 70 years later — and lock in dietary preferences for life — then public-health debates over infant and toddler nutrition carry far higher stakes than previously assumed, because the effects compound silently across a lifetime.
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