AMPK: The Energy Sensor Exercise Triggers

AMPK is activated when cellular energy (ATP) is low — exactly what happens during exercise. AICAR tricks cells into activating AMPK without the energy drain, turning on fat oxidation and glucose uptake. In mice, this improved endurance without training.

That 'exercise in a pill' framing attracted athletic-doping attention and also underscored AICAR's broad, non-specific effects — which is why it remains a research tool rather than a therapy. This thread covers the AMPK pathway and the caveats.