Such a diet in children increases the risk of depression in adulthood. There are results from a huge study

Researchers from Sun Yat-sen University in Guangzhou found that reducing sugar intake during the first thousand days after conception may lower the risk of anxiety and depression later in life. They analyzed data from over 66,000 participants in the UK Biobank, focusing on those affected by sugar rationing in the early years. The study revealed that sugar rationing was associated with a 17% lower risk of anxiety disorders and a 14% lower risk of depression. The strongest effects were observed in individuals who experienced rationing from conception to two years old. The findings suggest a need for further research on the impact of early nutrition on mental health.