Lower testosterone levels were predictive of rheumatoid factor (RF)-negative rheumatoid arthritis (RA) in men according to a new case-control study. Low testosterone raised the odds for subsequent diagnosis of rheumatoid factor (RF)-negative RA by 69% as compared with men who had normal values. Men who developed RF-negative RA also had significantly higher levels of follicle-stimulating hormone prior to diagnosis.
Male pattern baldness may be a telltale sign of heart disease, a review of six studies involving nearly 40,000 men suggests.
The meta-analysis, published in the online journal BMJ Open, showed that vertex baldness, but not frontal baldness, was significantly associated with an increased risk of chronic heart disease (CHD).
Watching too much television watching can lower sperm concentration and lower total sperm count in young men, according to a study published in the British Journal of Sports Medicine.
The study supported by the National Institutes of Health and the European Union, links TV time to poorer sperm quality and lower sperm count.