Uploaded August 2026 | Updated September 2026, 2 weeks ago
Your IGF-1 goes up for a lot of reasons. Protein raises it. Lifting raises it. So does cardio. So here's the tell. If a high IGF-1 by itself were quietly giving people cancer, then the two things that raise it the most, training and exercise, would raise your risk. Instead they lower it. In nearly a million and a half people, the most active ones had less cancer, including less colon cancer, the exact cancer the IGF-1 story is telling you to worry about.
Your IGF-1 goes up for a lot of reasons. Protein raises it. Lifting raises it. So does cardio. So here's the tell. If a high IGF-1 by itself were quietly giving people cancer, then the two things that raise it the most, training and exercise, would raise your risk. Instead they lower it. In nearly a million and a half people, the most active ones had less cancer, including less colon cancer, the exact cancer the IGF-1 story is telling you to worry about.
