Lifestyle & longevity

Design daily habits that support hormonal balance and long-term vitality. Master sleep and circadian timing, eat for metabolic stability, and use micronutrients with purpose. Make informed choices about alcohol, nicotine, sauna, and cold exposure. We translate longevity research into clear, practical playbooks you can apply today.

Celsius vs Red Bull caffeine: What the research says

Celsius vs Red Bull caffeine: What the research says

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 23, 2025 · 15 min read

Celsius has more caffeine than classic Red Bull (about 200 mg per 12 oz vs about 80 mg per 8.4 oz). Celsius is usually sugar-free and lower in calories, while classic Red Bull is lower in caffeine but far higher in sugar in the regular version, so Celsius can be healthier than regular Red Bull ...

Is nitrate free bacon actually better for you?

Is nitrate free bacon actually better for you?

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 22, 2025 · 12 min read

“Nitrate free” bacon isn’t meaningfully healthier because it typically still contains natural nitrates (often from celery juice powder) that convert to nitrites and can form DNA-damaging nitrosamines in the stomach or during high-heat cooking. What matters more for risk is that bacon is still processed meat (a WHO Group 1 carcinogen). It also depends on ...

Are perfect bars healthy or just clever marketing?

Are perfect bars healthy or just clever marketing?

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 22, 2025 · 10 min read

Perfect Bars are not automatically “healthy.” Despite whole-food ingredients like nut butter and honey, their sugar and calorie load can, for some people, raise glucose and insulin similarly to other high-sugar snacks when eaten away from hard training.[2] An endocrinologist explains how sugar sources, sweeteners, and even snack format (bar vs. shake) can shape satiety, ...

What is the difference between magnesium citrate and magnesium glycinate?

What is the difference between magnesium citrate and magnesium glycinate?

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 22, 2025 · 11 min read

Magnesium citrate is more likely to loosen stools and help constipation, while magnesium glycinate is typically better tolerated and is commonly used for sleep and daily supplementation. Here is the evidence-based breakdown of how citrate and glycinate affect your digestion, sleep, and absorption differently. “Patients often grab the first magnesium bottle they see, not realizing ...

Why do energy drinks make me tired? The crash mechanics and the best cutoff before bed

Why do energy drinks make me tired? The crash mechanics and the best cutoff before bed

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 21, 2025 · 14 min read

Energy drinks can make you tired because caffeine and sugar can create a short-lived spike followed by a “crash,” and caffeine can also disrupt sleep long after the can is empty. If you keep asking “why do energy drinks make me sleepy,” the answer is often a mix of brain chemistry, blood sugar swings, hydration, ...

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