But the question remains,is it the type of fat (saturated vs. unsaturated) , the amount of fat, or a combination of both?

A more recent study showed a significant decrease in testosterone in male endurance athletes who switched from a meat rich diet to a lacto-ovo diet.(5.)

What's interesting in this study is that the athletes didn't decrease the amount of fat they consumed only the type.

It 's clear from the evidence that diet influences resting testosterone(6). But how much fat should you consume?

The answers aren't clear cut, but at least 30% of total calories should come from fat. Should you increase your saturated fat intake and increase your risk for heart disease and cancer in an effort to naturally increase testosterone levels? ( more on this on The Fat Truth )

Perhaps it depends on your alternatives and your current state of health. ONe thing is for sure there's is no need to cut fat from your diet.

And remember, in none of these studies were changes seen overnoght. It takes time--at least 2 to three weeks for changes to occur.

James Jordan comments on this article:  First this is a totally independent article I dug up from my research archives written by Lynn Christenson. The truth is I have been saying for over ten years that to gain muscle naturally you need higher levels of  fat in the diet specifically saturated fat.  This may go against what many popular diet gurus say but then again no matter what the marketing pitch they use to sell their programs, it is no secret that 99% of bodybuilding programs on the market are useless unless you are roided up to the hilts( taking steroids and growth hormones).

The only programs i know that meet the requirements of the research in this article and scientifically are designed for the natural trainer to build muscle are:

• Underground Mass Secrets ( a blatent plug ) 
• Gain Mass by Anthony Ellis

More on this coming soon...

References:

1. Dorgan JF et al. Effects of dietary fat and fiber on plasma and urine androgens and estrogens in men: a controlled feeding study. AM J CLIN NUTR,1996;64(6):850-855

2.Hamalainene E, Aldercreutz H. Puska P and Pietinen P. Decrease of serum total and free  testosterone during a low fat high fibre diet. J Steroid Biochem,1983;18(3):369-370

3. Hamalainene E, Aldercreutz H. Puska P and Pietinen P. Diet and serum sex hormone levels in healthy men. J Steroid Biochem 1984;20(1);459-464

4. Key TJA. Testosterone, sex hormone binding globulin,claculated free testosterone, and oestradiol in male vegans and omnivores.BR J Nutr,1990;64:111-119

5. RabenA et al. Serum sex hormonesand endurance performance after a lacto-ovo vegetarian and mixed diet. Med Sci Sports Exer,1992;24:1290-1297.

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