Low Testosterone Linked To Alzheimers

A recent publication in the medical journal Neurology by Dr. Susan Resnick revealed a surprise link between a lack of testosterone and Alzheimer’s disease.

574 men from the Baltimore Longitudinal Study of Aging who had been followed for about 19 years were analyzed with respect to hormonal factors and their neurological status was also observed. Of these men who ranged in age from 32 to 87 years initially 54 were diagnosed with Alzheimers disease.

When the researchers looked at the hormone status of the men whose mental functioning stayed stable versus those who developed Alzheimers, it was clear that the height of the free testosterone level in the blood (expressed by dividing testosterone by the sex hormone-binding globulin) was a significant predictor for not getting Alzheimers. In other words, if men could maintain a stable level of free testosterone with aging they were significantly protected from Alzheimers disease. The effect was so marked that the blood test could predict 10-years in advance whether a man would develop Alzheimers in future or not. There was a 26% reduction in the risk of Alzheimers with each 10-unit increase in free testosterone.

The same edition of Neurology contains a second report by Dr. Gian Benedetto Melis and coworkers (University of Cagliari, Italy) where around 100 patients (males and females) with Alzheimers were compared with a similar number of patients without Alzheimers. All of their body mass index was in the normal range (20 to 22). These researchers found that the Alzheimers group (both male and female) had an extremely high sex hormone-binding globulin.

Low Testosterone Linked To Alzheimers

Low Testosterone Linked To Alzheimers

The testicles in males and the adrenal glands in males and females can produce testosterone. Dr. Resnick remarked that free testosterone can enter the brain tissue (via the blood brain barrier) easily and act directly on the brain or can be converted to estrogen. Estrogen has been shown in other studies to have a protective effect against Alzheimers. Dr. Resnick cautioned that another study where males with low testosterone levels are getting testosterone supplementation has to be done first before a male should be advised to get treated with testosterone for prevention of Alzheimers disease.

This article is based on a publication by Dr. Resnick et al. in Neurology 2004;62:188-193,301-303.

Comments: It is interesting to note that the “old fashioned” remedies such as weight loss, exercise (particularly anaerobic exercises such as weight training) and a low glycemic diet will naturally increase testosterone levels and vitality in both sexes. A comprehensive program such as the zone diet (by Dr. Barry Sears) or a similar such low glycemic program when combined with exercise will automatically make you lose weight down to a normal body mass index and allow you to maintain it without hunger pangs. It will also normalize hormones in most people on its own as previously elevated insulin levels normalize and the sex hormone-binding globulin will normalize as well. This will make the necessary hormones available to you whether female or male, will prevent osteoporosis (from exercise) and provide enough hormones before and after menopause or andropause to most people. Only a minority of patients will need to get blood tests from their doctors depending on symptoms and those need to seek medical advice to see whether they might benefit from bioidentical hormone replacement therapy.

Further information can be found here: bioidentical hormone replacement.

Last edited October 26, 2014


Exercise Saves Lives In Women Over 65

A recent study released in the Journal of the American Medical Association (JAMA Vol. 289 No. 18, May 14, 2003) has found a profound effect of exercise on the survivial of elderly women. Dr. Gregg et al. have followed 9518 women aged 65 or older for a total of 12.5 years with a follow-up visit in between at about the 6 year point. They found that women who exercised (walking, aerobics etc.) and who were compared with a control group who was sedentary (no form of exercise), had the following improved survival rates.

These findings were independent of other factors up to an age of 75 years. In other words, age, smoking, weight and a number of pre-existing diseases did not influence these improved survival figures from the effect of exercise. However, when a woman had a significant chronic disease or was older than 75 years of age, the survival improval from exercise was not as strong as indicated in the table above. Also, the follow-up visits showed that those women who exercised continually, had the highest survival advantage.

Exercise Saves Lives In Women Over 65

Exercise Saves Lives In Women Over 65

The bottom line: increasing and maintaining a physical exercise program will likely lead to a longer life. At the same time the exercise program needs to be started early enough to be of benefit to those who are older than 75 years of age.

Disease and death rate reduction from exercise in women aged 65 and over
Reduction of:
Effect of risk reduction:
overall death rates 48%
cardiovascular disease 36%
cancer 51%

Some of the Associations that were contributing to this important study were: The National Center for Chronic Disease Prevention and Health Promotion (Atlanta, Ga), the Graduate School of Public Health, University of Pittsburgh (Pittsburgh, Pa), the Prevention Sciences Group, Departments of Medicine and Epidemiology and Biostatistics, University of California (San Francisco) and the University of Minnesota and Section of General Internal Medicine, Veterans Affairs Medical Center, Minneapolis.

Here is a fitness link: http://www.nethealthbook.com/articles/fitness.php

Last edited December 9, 2012


More Exercise Leads To More Health

Based on an article in the Journal of the American Medical Association (JAMA 2002;288:p.1994-2000) Dr. Mihaela Tanasescu and his group from Loma Linda University in California have followed more than 44,000 health care professionals every 2 years for 12 years.

He asked the question whether a difference could be found between light, moderate or heavy exercise in the prevention of heart attacks.

Here is what they found: 1700 new cases of heart attacks as a result from hardening of arteries were mostly found in those who did NOT exercise or were in the LIGHT aerobic category. The more the persons exercised, the more pronounced the heart protective effect was. For instance, the group of men who engaged in a heavy exercise program had developed 17% less heart disease than the group with the light exercise program. Contrary to the marathon runner studies that had reported a detrimental effect at the high end, this study did not find this effect.

Also, this study is one of the first to show that weight training and other muscle strengthening activities also reduced strokes and heart attacks. Up to now the medical community was of the opinion that body building type muscle training might not prevent strokes or heart attacks.

More Exercise Leads To More Health

More Exercise Leads To More Health

The authors concluded that a combination of aerobic exercises(brisk walking, running, sports etc.) with muscle strengthening exercises(body building, stretching exercises, weight lifting etc.) will give the most beneficial heart protecting health effect. Try these useful related links to chapters of my free Internet based Nethealthbook:

Hardening of the arteries:


Last edited October 25, 2014