And when an impaired exercise-induced testosterone response can go on to affect performance, growth and recovery, it’s not what lifters want. The study also highlighted evidence that testosterone didn’t just dip at rest, but that it also dropped during and after workouts. The health and fitness world is obsessed with protein – and for good reason. Different protein sources may have differential effects on TT, thus future research may also examine the effects of plant versus animal, and whole food versus powdered protein. Animal models of induced hyperammonaemia increase systemic inflammation (Balzano et al., 2020); and although not completely consistent, generally increase oxidative stress as well (Bosoi et al., 2012; Yan et al., 2021). Human and rodent studies indicate that cortisol upregulates the urea cycle (Okun et al., 2015).
Aim to include resistance training sessions at least three times per week. The majority of daily testosterone is released during sleep. Excess belly fat, in particular, is linked to lower testosterone. "High protein" was defined as more than 35% of calories from protein, or at least 1,005 calories (251g). The authors’ definition of "high" or "low" for any macronutrient was based on relative terms as a percentage of total calorie intake rather than an absolute number of grams. Unlock all the essential details about NiHPRO®, the next-generation protein isolate, by downloading our exclusive brochure. Check out our most recent posts below and be sure to follow us for daily inspiration, news, and tips on achieving your wellness and nutrition goals with NiHPRO® Hydrolyzed.
Similar efforts have been made in regard to low-carbohydrate diets (Noakes and Windt, 2017), which also suffer from a plethora of definitions. The terms high-, moderate-, and low-protein diet have no unified definition, and thus without this, remain inherently subjective. ‘High-protein’ has no standard definition relating to the amount of dietary protein (Westerterp-Plantenga, 2007), leaving it open to interpretation when used in isolation. If sleep stays strong and training feels better, coffee is helping your bigger goal. The risk case is that it chips away at sleep and recovery, which can pull testosterone down over time.
From behind-the-scenes R&D to exciting product updates and expert insights, our Instagram feed gives you a closer look at the innovations driving NiHPRO® Protein Isolate and our commitment to sustainability and health. In endurance and performance nutrition, carbohydrate is often treated like a commodity. Whey, casein, and high-quality plant proteins provide complete amino acid profiles are recommended. Protein ingestion stimulates MPS through activation of the mTOR pathway, and testosterone enhances this process synergistically . It also influences satellite cell activation, supporting muscle repair and growth. Users should not disregard, or delay in obtaining, medical advice for any medical condition they may have and should seek the assistance of their health care professionals for any such conditions. Treatment of male hypogonadism partially reverses oxidative stress in patients with hypogonadism.
Stress and high cortisol can also increase food intake, weight gain, and the storage of harmful body fat around your organs. A healthy balance of protein, fat, and carbs can help optimize your hormone levels and support your overall health. Some research shows that a low-fat diet could decrease testosterone levels. Resistance training, such as weightlifting, has been shown to boost testosterone levels in the short term. Your health data (testosterone levels, weight, medications) never leaves your device. As I mentioned above, under-eating can impact men’s health and hormones too, especially when protein intake is not adequate.
The study also noted that men’s testosterone concentration is increased directly after a heavy resistance training session. Participants in a six-week resistance training program either had a post-workout shake with 1.2g of whey protein per kg of body weight or no shake. Low-carb diets result in much higher cortisol after long-duration exercise. Notice that the study title is actually about low-carb diets and not high-protein diets. When it comes to making claims about protein and testosterone (or any subject that has been studied), we can’t take any one study out of context without considering the entire body of evidence. Physical exercise, particularly resistance training, is known to acutely elevate testosterone concentrations, while chronic training adaptations influence baseline levels . High-protein diets and testosterone.
However, new research has flagged that chasing more extreme protein intakes can have adverse effects. Lifters, if your protein intake is super high, your testosterone response could be suffering, according to new research Thus, inflammation and oxidative stress caused by hyperammonaemia may impair testosterone levels.

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