These Foods Tank Testosterone, Lower Sperm Count

Mike has been using Joovv since 2018 and recounts a striking anecdote: a close person with an identical twin uses his Joovv panel daily; her skin appears markedly younger than her twin's despite other variables. He also did a personal testosterone experiment documented on his channel where he measured before and after, suggesting a positive effect. He positions Joovv as a clinically-backed, modular system that allows users to start small and expand for full-body coverage. He appreciates that the wavelengths are precisely in the therapeutic range with verified intensity, making it 'actually really work' as opposed to cheaper alternatives.

The study involved 43 males of reproductive age, with each participant undergoing both a 3-week unprocessed food diet and a 3-week ultra-processed food diet separated by a 12-week washout. In the adequate-calorie arms, the processed food group still gained more body weight and fat mass. Even in the excess-calorie arms, those eating whole foods gained less fat and showed a trend toward better lean mass retention. This flies in the face of the strict energy balance model, as the researchers themselves stated: 'calories from unprocessed or ultra-processed foods are not equally stored or metabolized even when controlled for macronutrient load.' Mike Mutzel points to the potential catabolic effect of insulin resistance despite insulin being an anabolic hormone, speculating that the supraphysiological insulin spikes from UPF might paradoxically lead to muscle loss in some individuals. He connects this to the broader statistics that 60% of North American calories come from UPF and 73% of Americans are now obese, suggesting these findings are highly relevant to public health.

The study measured environmental contaminants in both serum and semen. Figures showed marked elevation of heavy metals (mercury, lead) and phthalates as well as PFAS in the UPF arm, while the unprocessed arm did not exhibit these spikes. Mike Mutzel notes these chemicals are 'laden with persistent organic pollutants' due to food processing, packaging, and agricultural residues. He underscores that these toxins not only disrupt endocrine function but also can directly affect sperm quality. The rapid appearance in semen is particularly concerning for reproductive health, and he suggests this is an independent reason to avoid UPF, separate from palatability or glycemic effects.

Mike opens the video stressing that men often assume fertility issues are their partner's fault, but this study flips that notion. The researchers observed marked declines in all sperm parameters alongside lower testosterone, even when the UPF diet was isocaloric and the participants were lean. He notes the rise in insulin and C-peptide on the UPF diet, suggesting insulin resistance may play a role, but the independent effect of processing could involve inflammation (increased CRP and interleukins) and the environmental chemicals previously described. He emphasizes that for anyone trying to conceive, switching to a whole foods diet for at least 3 weeks could be critical.