The new co-host of Iron Culture, Eric Trexler, is back with another (monster) episode. In this episode we take a look at everyone's favorite hormone, testosterone. 

Specially, Dr. Trexler examines the role of maconutrient changes on testosterone levels. How does fat & carbohydrate intake impact a person's testosterone?

We also explore body composition differences and how this can have an even larger impact on one's testosterone. Lastly after sharing the not so pleasant realities of dieting and experiencing low testosterone symptoms, Eric shares key points for maintaining a healthy level of testosterone.

00:00 Reading comments: the people know what they like (Eric)

Iron Culture Ep. 243- It's Not JUST About Calories (ft. Eric Trexler) https://www.youtube.com/watch?v=CrDV1yADIiQ 

10:07 Dietary/macronutrient modifications to support or boost testosterone levels

Whittaker 2021 Low-fat diets and testosterone in men: Systematic review and meta-analysis of intervention studies https://pubmed.ncbi.nlm.nih.gov/33741447/

Whittaker 2022 Low-carbohydrate diets and men's cortisol and testosterone: Systematic review and meta-analysis https://pubmed.ncbi.nlm.nih.gov/35254136/

Smith 2022 Examining the effects of calorie restriction on testosterone concentrations in men: a systematic review and meta-analysis https://pubmed.ncbi.nlm.nih.gov/34613412/

24:53 Interpreting the effects of protein on testosterone during carbohydrate restriction

32:34 Relationship between adiposity and testosterone

41:19 When does testosterone start to drop?

Keys 1952 Biology of Human Starvation https://www.semanticscholar.org/paper/Biology-of-Human-Starvation-Widdowson/6f38ee886f39daa656b1ac9ceb8a3c0785e100eb

54:22 Muscle hypertrophy and testosterone

1:06:38 The effect of changes in body fat levels

MASS Research Review https://massresearchreview.com/ 

Helms 2023 Effect of Small and Large Energy Surpluses on Strength, Muscle, and Skinfold Thickness https://www.researchsquare.com/article/rs-3184470/v1

1:19:34 Other factors which may influence testosterone levels

Kerksick 2018 ISSN exercise & sports nutrition review update: research & recommendations https://pubmed.ncbi.nlm.nih.gov/30068354/

1:34:37 The Trex lore

1:42:28 Wrapping up

Instagram @trexlerfitness https://www.instagram.com/trexlerfitness/?hl=en

Website https://trexlerfitness.com/ 

MASS Research Review https://massresearchreview.com/ 

MASS YouTube https://www.youtube.com/@MASSResearchReview