My three valves

Article Abstract:

A physician recounts his experience with two heart valve replacements for aortic valve insufficiency. He had rheumatic fever as a child and thereafter had a heart murmur. He had no symptoms until 1983, when he began experiencing chest pain after running. His aortic insufficiency had progressed to aortic stenosis. In 1984, at the age of 47, his cardiologist recommended heart valve replacement. He chose a bioprosthetic valve (one from a slaughtered animal) because these valves, unlike mechanical valves, do not cause blood clots and he did not want to take anticoagulants. However, just eight years later, in 1992, he began experiencing severe chest pain and was admitted to a hospital one hour later. One cusp of the valve had torn, leaving it inoperable. His third valve was a mechanical Saint Jude valve, which should last 30 years. However, he will have to take anticoagulants for the rest of his life.

Editorial, Personal narratives, Heart valve diseases, Heart valve replacement

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How optimal are computer-calculated optimal diets?

Article Abstract:

Research designed to clarify the meaning of an 'optimal' diet has focused on assessing and comparing the conditions under which the optimization calculations are carried out in both the non fuzzy and the fuzzy approach. It has been established that both approaches are capable of determining diets which meet the corresponding main and side conditions. However, the fuzzy approach poses a number of problems, including the fact that the fuzzification of the objective nutritional requirements does not lead to an individualization of the evaluation of the nutrient intake. Overall, no totally satisfying optimization approach is available, although fuzzy logic does enrich nutrition optimization.

Nutritional requirements

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Three top low-fat diets

Article Abstract:

TheCenter for Science in the Public Interest (CSPI) recently sponsored a nutritionconference in Washington, DC, wherein three leading national diet and nutritionexperts debated on the ideal American diet. As it turned out, there was no consensus on just one single diet prescription.

Conferences, meetings and seminars, Public opinion, Low-fat diet, Low fat diet, Nutritionists, Center for Science in the Public Interest

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