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Posted on Tuesday August 13, 2024 in Glucose and Insulin Dynamics
An article written by Dr Edward Leatham, Consultant Cardiologist © 2024 E.Leatham
Glucose spikes refer to rapid rises in blood sugar levels following meals. While occasional increases are normal, frequent or exaggerated spikes are increasingly recognised as harmful to long-term cardiovascular and metabolic health.
Repeated glucose surges contribute to:
From a cardiovascular perspective, this is important because abnormal glucose regulation accelerates atherosclerosis and increases the risk of coronary heart disease, even before diabetes is diagnosed.
The goal is not to eliminate glucose rises completely, but to reduce their size and frequency, creating more stable metabolic control over time.
One of the easiest and most effective techniques is changing the order in which foods are eaten.
Evidence suggests that eating:
can significantly blunt the post-meal glucose rise. Fibre, fat, and protein slow gastric emptying and reduce the speed at which glucose enters the bloodstream.
This simple behavioural change often improves glucose control without altering total calorie intake.
Not all carbohydrates behave the same way. Highly refined carbohydrates are absorbed rapidly, producing sharper spikes, while minimally processed sources lead to a slower and more gradual rise.
Helpful strategies include:
Combining carbohydrates with protein or healthy fats further reduces their glycaemic impact.
Light activity after eating can have a powerful effect on glucose regulation. Muscle contraction allows glucose uptake independent of insulin, helping to clear glucose from the bloodstream more efficiently.
Even modest movement can help:
This is often one of the most underestimated tools for improving metabolic stability.
A key but often overlooked factor in glucose control is skeletal muscle health.
Skeletal muscle is the body’s largest site of glucose disposal. The more metabolically active muscle tissue a person has, the more effectively glucose can be cleared from circulation. Reduced muscle mass is strongly linked to insulin resistance, higher glucose variability, and increased cardiovascular risk.
Maintaining or increasing muscle strength therefore represents a core strategy for long-term metabolic and cardiovascular prevention.
Adequate protein intake supports muscle maintenance and recovery and helps stabilise blood glucose levels by slowing digestion and increasing satiety.
Practical approaches include:
Many adults — particularly from mid-life onwards — unintentionally under consume protein, which can contribute to loss of muscle mass and worsening metabolic health.
Resistance or strength training is one of the most effective interventions for reducing glucose spikes and improving insulin sensitivity.
Unlike aerobic exercise alone, resistance training:
Examples include:
Ideally, strength-focused exercise should be performed two to three times per week alongside regular aerobic activity.
From a cardiology perspective, improving muscle strength is increasingly recognised as a powerful preventive strategy that complements traditional risk-factor management.
Poor sleep and chronic stress raise cortisol levels, which can increase glucose output from the liver and worsen insulin resistance.
Helpful habits include:
Metabolic health is deeply connected to sleep quality and nervous system balance.
Not all patients experience glucose spikes in the same way. Factors such as age, body composition, fitness level, genetics, and underlying insulin sensitivity all influence glucose responses.
In clinical practice, personalised strategies often include:
For some individuals, continuous glucose monitoring can provide additional insight into how specific foods and behaviours affect their metabolic responses.
Glucose control is not just about diabetes prevention. Repeated glucose variability contributes directly to vascular inflammation and endothelial dysfunction — key drivers of atherosclerosis.
Reducing glucose spikes therefore supports:
Importantly, strategies that improve glucose stability — particularly resistance training and muscle maintenance — also improve overall functional capacity and resilience.
Managing glucose spikes does not require extreme diets or complicated interventions. Small but consistent changes can have a powerful cumulative effect.
Key principles include:
Together, these approaches help stabilise glucose levels, improve metabolic health, and reduce long-term cardiovascular risk.
Further reading
In cardiometabolic medicine, muscle is not a cosmetic tissue but a metabolic organ. Evidence consistently shows that strength, not muscle mass, predicts insulin resistance, cardiovascular risk, and survival. Many older adults are not losing muscle tissue — they are losing muscle function, and that is the pathology that matters.
Atrial fibrillation is a common but manageable heart rhythm condition. Understanding how it affects your heart rate, particularly during illness, empowers you to monitor changes early and work proactively with your doctor. With the right knowledge and self-care, you can confidently take control of your heart health.
HIIT interrupts this cycle by dramatically improving insulin sensitivity and glucose uptake in skeletal muscle — particularly in the large lower-limb muscles of the thighs and glutes. A single 20-minute session of HIIT can activate GLUT-4 transporters in muscle cells for up to 24–48 hours, drawing glucose out of the bloodstream and away from storage in the liver and visceral fat depots.
In atrial fibrillation or AFib, the atrial tissue quivers at approximately 600 cycles per minute, which means that it has no useful pumping function. The left atrium therefore, in patients with atrial fibrillation, merely acts as a passive conduit between the lungs and the left ventricle. It no longer serves to prime the left ventricle, and as a result, less blood enters the heart during diastole, less 'priming' occurs so cardiac output may fall. If ever you have experienced a car's turbo charger going 'on the blink' you will know that the car still GOES, but not very well, since it too suffers loss of output. The left atrial pressure in many such cases will increase, causing oedema or fluid in the alveolar space, reducing gas exchange and contributing to the symptom of breathlessness.