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

The science of caffeine free energy drinks: How to boost focus without the crash

Dr. Jonathan Pierce, PhD: Clinical Psychologist & Neuroscience Specialist

Jan 10, 2026 · 11 min read

For years, “energy” has been synonymous with “stimulation.” But a new wave of non-caffeinated options is changing how men fuel their workdays and workouts. Here is the physiology behind generating power without the jittery debt. “We often confuse agitation with energy. Caffeine borrows energy from your future by blocking sleep signals, but it doesn’t actually ...

The science of supplements: which vitamins actually fight male fatigue?

Dr. Susan Carter, MD: Endocrinologist & Longevity Expert

Dec 18, 2025 · 11 min read

You feel drained despite sleeping, and that second coffee isn’t touching it. Before you accept low energy as the cost of modern life, look at your biochemistry. Here is the evidence-based guide to the nutrients that power male physiology. “Fatigue in men is rarely just about lack of sleep. It is often a cellular inefficiency. ...

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 ...