#69 – Ronesh Sinha, M.D.: Insights from a patient population predisposed to metabolic syndrome

High triglycerides, often seen as 'blood fat', are primarily influenced by carbohydrate intake, not just dietary fat. Dr. Sinha explains to his patients that excess glucose from carbohydrates is converted into triglycerides within fat tissue through hormonal mechanisms, demonstrating this with diagrams and animations.

Subcutaneous fat is located just under the skin and acts as a 'safety belt', insulating and protecting from fat spillover. Visceral fat, located around internal organs, is more metabolically active, is loosely organized, has direct access to the liver and bloodstream, and is associated with more inflammatory chemicals. A higher proportion of visceral fat, even at low body weights, is concerning for metabolic health.

HbA1c can be discordant with actual average blood glucose levels in a significant portion of patients, either underestimating or overestimating. This makes it less reliable for precise metabolic assessment, especially between 5% and 6%. Continuous Glucose Monitors (CGM) offer more accurate real-time insights into glucose fluctuations, making them a preferred tool for understanding glycemic control.

Cortisol is a significant regulator of morning blood sugar. In insulin-resistant individuals, elevated cortisol levels, particularly at night due to stress or poor sleep, can increase free fatty acid release from adipose tissue. These free fatty acids fuel gluconeogenesis in the liver, leading to higher fasting blood sugars. Addressing nighttime routines and stress can improve these levels.

The 'thrifty gene' theory proposed that insulin resistance evolved to allow ancestors to store calories during feast times for famine survival. The 'Barker hypothesis' suggests that the intrauterine environment triggers insulin resistance, with low birth weight correlating inversely with cardiovascular mortality. Both theories point to evolutionary adaptations influencing metabolic health.

Brown adipose tissue (BAT) is metabolically active fat with many mitochondria, generating heat. Populations migrating to colder climates tend to have more BAT, which is linked to lower insulin resistance and can act as a glucose disposal organ. Studies show that South Asians have significantly less BAT compared to Europeans, which may contribute to their higher insulin resistance.

Dr. Sinha advocates for a balanced exercise approach, especially for South Asian patients who might lose muscle mass with excessive endurance training. He emphasizes building leg strength and core stability, and incorporating both aerobic (Zone 2 cardio) and anaerobic (HIIT) training, while being mindful of not overdoing endurance to preserve muscle.

Stress and poor sleep significantly contribute to metabolic dysfunction, even more than diet and exercise for some. Dr. Sinha observes that women, in particular, may experience weight loss and improved metabolic markers when reducing stress and improving sleep, even with higher carbohydrate intake, as seen in patients returning to India for family visits. Chronic stress causes systemic inflammation that affects fat cells.

Dr. Sinha views phones and digital media as analogous to drugs or toxins, advising to delay exposure as much as possible. While some introduction might be necessary for social integration in middle school, strict boundaries are crucial. Excessive screen time is linked to family conflict, attention deficits, social comparison issues, and can normalize unhealthy habits, urging parents to model responsible use and encourage alternative hobbies.