A study involving 2,000 office workers in the United Kingdom has found that consuming a breakfast high in sugar is associated with increased feelings of tiredness and lower mood before midday. The research, conducted by British Lion Eggs and supported by dietitian Nichola Ludlam-Raine, identified a statistical correlation between sugary morning meals and declines in energy, mood, and concentration.

According to Ludlam-Raine, breakfasts rich in free sugars or refined carbohydrates but lacking in protein and fiber can cause blood glucose levels to fluctuate rapidly. These fluctuations may lead some individuals to experience a noticeable drop in energy and focus later in the morning, although the effects are not uniform across all people.

The findings suggest that the composition of the first meal of the day could play a significant role in maintaining alertness and emotional well-being during work hours. While the study is observational and does not prove causation, it highlights potential drawbacks of high-sugar breakfast choices among office workers.