Climate and nutrition research counted 78 studies. Only 3.8% examined the food environment, while half studied child stunting

When rain arrives late, a heatwave lasts or a flood cuts a road, the nutrition effect can travel through harvests, prices, household income and the food within reach. A scoping review published in Current Nutrition Reports on 29 October 2026 mapped 78 studies that connected climate variability or extreme weather with body measurements, food security or the food environment.

The research was concentrated in a small part of that chain. Half of the studies were conducted in Africa, 82% focused on children under five and 50% studied child stunting. Rainfall or temperature variability appeared in 71.7% of the studies, while 35.8% examined extreme events. Across the literature, unusual rainfall was associated with stunting and greater food insecurity; higher average temperatures and heatwaves were linked with lower weight-for-height, weight-for-age or birth weight in most of the studies that examined those outcomes.

Those patterns do not amount to one pooled effect size or prove that every hot spell causes a child to lose weight. This was a scoping review: its purpose was to show what has been studied and what the studies reported, not to combine comparable trials or establish a single causal estimate. The included work used different populations, exposures and outcomes, so a percentage describing the literature is not the same thing as a percentage describing a person's risk.

The gaps may be the most useful result. Only 12.8% of the studies addressed food security and just 3.8% examined the food environment — the availability, affordability and surroundings that shape what people can buy and eat. Nearly half of the included studies had been published since 2021, yet evidence remained heavily weighted toward child undernutrition rather than obesity, adult nutrition, food access or how several disadvantages overlap.

The grounded takeaway is not a new diet rule. It is that nutrition planning for climate shocks needs better local information: not only children's height and weight, but whether food remains available, affordable and reachable, and which households are most exposed. The review found recurring warning signals, while also showing that large parts of the route from weather to the dinner table are still poorly measured.