Which of the following statements about blood sugar regulation is NOT true?

The statement regarding normal blood sugar levels being between 55-130 mg/dl is not accurate. Normal blood sugar levels for individuals without diabetes typically range from 70-100 mg/dl when fasting. After eating, blood sugar levels can rise and are generally expected to remain below 140 mg/dl within two hours post-meal. This framework is established based on clinical guidelines for monitoring and managing blood glucose levels, which emphasize a more specific and narrower range for normal conditions.

The other statements are true and align with established understanding of blood sugar regulation. Fluctuations in blood sugar throughout the day are normal and can occur due to various factors including food intake, physical activity, and hormonal changes. Additionally, insulin plays a crucial role in lowering blood sugar levels after eating by facilitating the uptake of glucose into cells, thus maintaining balance in blood glucose levels.