There's a lot of conflicting advice about nutrition these days. That can make it difficult to separate fact from fiction. A number of nutrition newsletters can help you sort out the truth. The following newsletters are worth the price you pay for them, according to CHANGING TIMES magazine.

- "Tufts University Diet & Nutrition Letter", P.O. Box 57857, Boulder, Colo., 80322, monthly, $20 per year, covers the gamut of nutrition and weight-management concerns. A recent issue looked at the healthful Chinese diet, compared 31 popular brands of pizza and dismissed claims for fish oil supplements.- "Environmental Nutrition", 2112 Broadway, Suite 200, N.Y., N.Y. 10023, monthly, $28 per year, summarizes a lot of interesting and useful information and presents it in a digestible format.

Some examples include the best baby food, an interview with an obesity expert and a rundown on the latest diet books. The newsletter is prepared by registered dieticians and is practical and timely. One disadvantage, according to CHANGING TIMES, is that there is too little independent analysis of the information that is provided.

- "Nutrition Action Healthletter, published by Center for Science in the Public Interest, 1875 Connecticut Ave., N.W., Suite 300, Washington, D.C., 20009, 10 times a year, $19.95, routinely criticizes the food industry.

Recent crusades include vitamins that don't dissolve, possibly hazardous packaging of microwaveable food and fat-filled "fat-free" luncheon meats.

The newsletter may well prod you into becoming a food activist.

- "Nutrition Forum", published by J.B. Lippincott Co., Downsville Pike, Route 3, Box 20-B, Hagerstown, MD 21740, bimonthly, $40 per year, discusses dubious marketing techniques and nutrition quakery including food fadists and others who promote quick dietary fixes.

Recent issues debunked macrobiotic diets as a cancer cure and AIDS treatment fraud.

- The "Mayo Clinic Nutrition Letter" just published its last issue which looks at past highlights. The issue is a capsule of some nutrition basics. For a copy send $3 to the Mayo Foundation for Medical Education and Research, 200 First St., S.W., Rochester, Minn., 55905.

Lower your blood pressure

A recent study by researchers at Johns Hopkins University School of Medicine published in the "Journal of the American Medical Association" says people who suffer from mildly high blood pressure may have an alternative to the $2.50-a-tablet treatment: exercise.

The study found that men with mild hypertension who exercise regularly without medication did as well as and in some cases better than their counterparts who took anti-hypertensive medication as well as exercised.

The study found that circuit weight training lowers blood pressure in people with mild hypertension rather than raising it, as it was believed.

That's good news for many of the 60 million people in the U.S. that suffer from hypertension.