Don's Comments : It's fascinating to see how many organizations, agencies, and even the media will report the correlation between the earlier onset of menstruation in young girls and the increased risk of breast cancer, but go on to say that the exact mechanism is "unknown", when the exact mechanism is definitely known ! It's hormones from animal products, mostly milk products. But saying so would severely hurt multi-billion dollar industries, so they simply report the problem and then raise money to research it, and raise money to find a cure for breast cancer. Money may make the world go 'round, but it won't cure breast cancer. The cure for the breast cancer epidemic is:
In contrast, Julio Collazos, ., of Hospital de Galdakao in Vizcaya and colleagues reported in the April 12, 2002 issue of AIDS that in a study of nearly 200 clinically stable HIV-positive men (average CD4 cell count 451 cells/mm 3 ; 64% with undetectable viral load ), most subjects had testosterone levels within the normal range. Men receiving no anti-HIV therapy had the lowest testosterone, while those using a regimen combining three classes of antiretroviral drugs had the highest levels. Among the 15 men who had both pre- and post-treatment testosterone measurements, levels increased after starting HAART. But because testosterone levels normally begin to decline around age 40 (a phenomenon known as "andropause"), the beneficial effects of HAART on hypogonadism may be offset as treatment enables HIV-positive men to live to older ages.
The secretion of hypothalamic, pituitary, and target tissue hormones is under tight regulatory control by a series of feedback and feed- forward loops. This complexity can be demonstrated using the growth hormone (GH) regulatory system as an example. The stimulatory substance growth hormone releasing hormone (GHRH) and the inhibitory substance somatostatin (SS) both products of the hypothalamus, control pituitary GH secretion. Somatostatin is also called growth hormone-inhibiting hormone (GHIH). Under the influence of GHRH, growth hormone is released into the systemic circulation, causing the target tissue to secrete insulin-like growth factor-1, IGF-1. Growth hormone also has other more direct metabolic effects; it is both hyperglycemic and lipolytic. The principal source of systemic IGF-1 is the liver, although most other tissues secrete and contribute to systemic IGF-1. Liver IGF-1 is considered to be the principal regulator of tissue growth. In particular, the IGF-1 secreted by the liver is believed to synchronize growth throughout the body, resulting in a homeostatic balance of tissue size and mass. IGF-1 secreted by peripheral tissues is generally considered to be autocrine or paracrine in its biological action.