Posts tagged caffeine intake | XY Files – Veedma's evidence-based men's health articles

Can i drink coffee while fasting? The metabolic rules you need to know

Dr. Susan Carter, MD: Endocrinologist & Longevity Expert

Nov 30, 2025 · 9 min read

For many intermittent fasters, the morning cup of joe is non-negotiable. But does that brew shut down fat burning or halt cellular repair? An endocrinologist breaks down the hormonal mechanics of caffeine during a fasted state. “From a hormonal perspective, the primary goal of fasting is to lower insulin levels to unlock fat stores. Black ...

Celsius caffeine vs Red Bull: which energy drink is really better for your body?

Dr. Susan Carter, MD: Endocrinologist & Longevity Expert

Nov 23, 2025 · 14 min read

Celsius and Red Bull promise quick energy, but their caffeine, sugar, and stimulant blends hit a man’s heart, metabolism, and hormones in very different ways. Here is how to choose the lesser risk — or skip both when you should. “When men ask me about Celsius caffeine vs Red Bull, I tell them to think ...

Why do energy drinks make me tired instead of energized?

Dr. Susan Carter, MD: Endocrinologist & Longevity Expert

Nov 21, 2025 · 13 min read

Energy drinks promise quick focus and stamina, yet many people feel strangely sleepy or wiped out once the buzz fades. Here is what the science says about caffeine, sugar, sleep, and stress hormones — and how to get real energy without crashing. “When patients ask me ‘why do energy drinks make me tired,’ we walk ...

The truth about energy drinks without sucralose: what to know before you crack a can

Dr. Susan Carter, MD: Endocrinologist & Longevity Expert

Nov 20, 2025 · 13 min read

Energy drinks without sucralose sound cleaner and safer, but the real health impact depends on what manufacturers use instead and how much you drink. Here is how to decode the labels and choose options that support energy, hormones, and long-term health. “When patients ask me about energy drinks without sucralose, I remind them that removing ...