A nutritionist has cautioned against popular packaged breakfast cereals, stating they are often high in sugar and refined carbohydrates. These cereals can cause rapid blood glucose spikes, leading to short energy bursts followed by fatigue and increased hunger. Healthline and the University of North Dakota support this, noting that such foods can elevate blood lipid levels, stress the metabolic system, and increase the risk of heart disease and type 2 diabetes over time.