For those born in Britain in the early 1950s, the amount of sugar available at home also depended on the calendar. Post-war rationing was still in force, then it was gradually dismantled. So people born a few months apart ended up spending their pregnancy and early life with very different access to sugary foods. Today that old ration card has become a kind of natural experiment: those who have remained under sugar rationing for longer show a lower risk of receiving an anxiety diagnosis in adulthood.
The association was found in a study published on Translational Psychiatryconducted by Hana F. Navratilova, Anthony D. Whetton and Nophar Geifman on 46,448 participants from the UK Biobank, born between 1951 and 1956. The researchers divided them based on the duration of rationing experienced from conception onwards, up to around 1000 days, i.e. pregnancy and the first two years of life.
The clearest difference appears after about 1000 days of rationing
The group that remained under rationing for the longest time, from conception until approximately two years, showed in the statistical model a hazard of diagnosis of anxiety that was 33% lower than the reference group born when rationing had ended: hazard ratio 0.67, with a 95% confidence interval between 0.53 and 0.84. The association remained even after accounting for demographic factors, lifestyle, health and sugar consumption in adulthood.
That 33%, however, is a relative measurement produced by the model. Looking at raw percentages, anxiety diagnoses ranged from 5.45% to 6.29% across groups; among those who had experienced approximately 1000 days of rationing the share was 5.79%. Less spectacular than “33% less”, much more useful for understanding what size we are talking about.
For depression the signal was there, but it held up worse. In the group exposed for longer the initial model indicated a 29% lower hazard. However, when the researchers also included sugar consumption later in life in the analyses, the association weakened to the point of losing statistical significance. For the anxiety, however, it remained.
Eating less sugar as kids didn’t turn them into sweet-allergic adults
It would be easy to think that those who had little sugar as a child had simply continued to eat less sugar throughout their lives, but the data is much less tidy. Among participants with information on food preferences, those exposed to rationing for about 1,000 days actually said they liked sweet foods a little less: 5.82 points versus 6.04 on a scale of nine. A difference of 0.22 points. Sugar consumption in adulthood also did not explain the observed association with anxiety.
So the difference in anxiety cannot be dismissed with a simple “they ate less sweets when they grew up”. The authors believe that the nutritional environment during a very early stage of development can have effects that reach much later in time. It is a hypothesis compatible with the study data, not evidence of an already clarified biological mechanism.
The researchers also checked available brain images for part of the sample. Of 139 gray matter regions analyzed, 80 initially showed differences between the groups and subsequent analyzes highlighted 11, including some areas of the cerebellum. Those differences do not prove that rationing changed the brain or that they are the cause of the lower incidence of anxiety. For now they just say that something changes along with exposure and deserves to be studied better.
The problem is, no one knows how much sugar they actually ate
Rationing offers researchers a very rare situation, but it has a rather obvious limitation: no one weighed the sugar in the tea of British mothers in 1952. The duration of the restrictions was used as an indicator of likely exposure. The “1000 days” group, for example, includes 6,856 people who had gone through pregnancy and the first two years of life under rationing.
In those years, then, not only sugar was rationed: meat, butter, cheese, cereals and other foods were also subject to restrictions, with different timetables. Health care, family conditions, infections, maternal stress and many other factors changed at the same time. Statistical models can try to take this into account; erasing Britain’s post-war half from an equation is another matter.
For this reason, the study does not demonstrate that reducing sugar during pregnancy or in the first two years prevents anxiety and does not provide parents with a new nutritional formula. However, it shows an association consistent enough to survive several sensitivity analyses, especially for anxiety. The University of Surrey itself speaks of a possible lasting relevance of the early nutritional environment on mental health, calling for further studies to understand through what mechanisms.
Sugar rationing belonged to a country still trying to emerge from the post-war period. Seventy years later, those restrictions are doing a completely different job: they help researchers understand how far the effects of the first years of life can reach. For anxiety, at least in this British sample, the trace seems to be there. Sugar alone is still not enough to explain why.
