Lean individuals may still face surprising blood sugar spikes, experts warn

Why Do Some Lean and Healthy People Experience Blood Sugar Spikes?

Conventional wisdom suggests that lean, active individuals with balanced diets are unlikely to face significant blood sugar spikes. However, emerging research and expert insights reveal that blood sugar regulation is influenced by a complex interplay of factors beyond body weight and food choices.

Beyond Weight: The Role of Metabolic Health

Kanikka Malhotra, a consultant dietician and certified diabetes educator, explains that body weight is not a reliable indicator of metabolic health. A person can appear thin but still have high levels of visceral fat around critical organs like the liver and pancreas—a condition known as TOFI (thin outside, fat inside). This hidden fat can disrupt glucose regulation, making even lean individuals susceptible to blood sugar spikes.

Additionally, genetic variations play a significant role. Differences in insulin secretion, receptor sensitivity, and beta cell reserve can lead to vastly different glucose responses, even among individuals consuming identical meals. For instance, some people inherit a delayed first-phase insulin response, causing their blood sugar to rise before insulin takes effect.

Muscle Mass and Lifestyle Factors Are Key

Malhotra emphasizes that muscle mass, rather than body weight, is a critical determinant of glucose stability. Muscles are the body’s largest storage site for glucose, and individuals with higher muscle mass are better equipped to manage blood sugar levels. Conversely, a lean person with low muscle mass may struggle to regulate glucose effectively.

Sleep and stress also play pivotal roles. A single night of poor sleep can reduce insulin sensitivity by nearly a third the following day, making blood sugar spikes more pronounced after meals. Similarly, stress-induced cortisol can trigger the liver to release stored glucose, leading to elevated blood sugar levels even without food intake.

Other Influences: Gut Health and Meal Composition

The diversity of the gut microbiome affects how quickly carbohydrates are broken down and absorbed, further influencing blood sugar responses. Even the sequence in which food is consumed matters—eating vegetables and protein before carbohydrates can significantly flatten glucose spikes.

When Should You Be Concerned?

An occasional rise in blood sugar after eating is normal. However, repeated spikes, slow recovery to baseline levels, or gradually increasing fasting glucose are warning signs of potential metabolic issues. In such cases, doctors may recommend tests like HbA1c, fasting insulin, or an oral glucose tolerance test to assess long-term glucose control.

Managing Blood Sugar Spikes

To improve glucose regulation, experts recommend regular exercise, strength training, prioritizing protein and fibre in meals, and ensuring adequate sleep. These lifestyle adjustments can help mitigate the risk of blood sugar spikes, even for those who appear lean and healthy.

This nuanced understanding underscores the importance of looking beyond appearances when assessing metabolic health. Blood sugar regulation is influenced by a combination of genetics, lifestyle, and physiological factors, making it a deeply individualised process.

Source: Indian Express