At 62, My Testosterone Went From 644 to 1,340 in 4 Months. No TRT.

Summary

At 62, Jimmy Eff Stewart says his total testosterone fell to 644 and free testosterone to 5.3 in April, the lowest readings in his records. He attributes the drop to under-fueling: he estimated burning about 2,450 calories daily while eating roughly 1,750–2,000 calories, and was also following a low-carb diet. He says his fasting insulin had fallen to 1.6 during the same period.

Over the next few months, he made one change: he drank about a gallon of milk every two days, adding approximately 1,200 calories and 96 grams of carbohydrates per day. He reports that his weight, training routine, and activity stayed about the same.

Follow-up tests showed total testosterone of 1,158 at LabCorp and 1,340 at Olympus. Free testosterone rose to 12.9, and fasting insulin to 3.1. Stewart says his LH and FSH were in the middle of the normal range, which he presents as evidence that his body was producing its own testosterone rather than receiving TRT.

He emphasizes that this was his personal experiment, not a general testosterone-boosting prescription. He describes two broad patterns he sees among men with low testosterone: under-fueling in lean, active men, and metabolic health issues in men carrying excess weight or with high blood sugar. He says the right approach may differ between them.

Key Strategies and Takeaways

• Consider whether you’re eating enough for your activity level. Stewart believes his calorie deficit, combined with high activity and low-carb eating, contributed to his low readings.
• Don’t assume age is the only explanation. He argues that lifestyle factors may also affect testosterone, while acknowledging that age can play a role.
• Don’t automatically copy his milk experiment. He warns that adding substantial calories and carbohydrates could worsen insulin problems for someone with excess weight or high blood sugar.
• For men with metabolic health concerns, he recommends focusing on eating patterns, movement, and sleep to improve metabolic health. He says testosterone may improve as well.
• Discuss changes and testing with a doctor. Stewart advises consulting a clinician before making major changes, especially when taking medication. The video mentions total and free testosterone, fasting insulin, LH, and FSH; he says he will discuss additional labs in a future video.

Presenters and Sources

• Presenter: Jimmy Eff Stewart
• Lab sources mentioned: LabCorp and Olympus
• Other source mentioned: An unnamed doctor who offered TRT