Obesity in combination with risk factors like diabetes, high blood pressure, high blood lipids, and smoking do indeed increase the risk of cardiovascular diseases, but being fat in itself poses no significant risk. And for overweight patients who have already suffered a heart attack, losing weight can even be dangerous.
The latter finding is presented in a dissertation by Linn Kennedy.
She studied more than 12,000 patients after myocardial infarction and compared developments in their weight and health. The results were unexpected: those who lost weight had a lower survival rate, while those who gained weight were none the worse for it, even if they were already overweight from the start.
“European recommendations state that overweight patients after myocardial infarction should be recommended to lose weight. But the recommendations are not based on any studies, because our study is in fact the first in the field. And it unfortunately indicates that medical science may have shortened the lives of a number of overweight patients with myocardial infarction by persuading them to diet!” says Linn Kennedy’s thesis director, Ronnie Willenheimer.
He now urges his patients who have had a myocardial infarction to eat healthful foods and exercise, but not to pay any attention to the numbers on the scales. And he also maintains that inexplicable weight loss in a patient after myocardial infarction should not be welcomed with joy: it might mean that the patient is sicker than was previously thought.
The fact that obesity does not seem to be harmful to patients after myocardial infarction may be due to the fact that it provides the body with more reserves for its metabolism. Modern drug treatment after a myocardial infarction may also play a role, since it seems to protect against the negative effects on health that obesity otherwise might entail.
The other dissertation on the theme of obesity was written by Susanna Calling. She used two large groups of more than 22,000 and more than 28,000 individuals respectively, individuals who were part of two major population studies in the city of Malmö.
By comparing their data with other registers, she was able to see which individuals later contracted cardiovascular diseases or died young.
In one of the studies Susanna Calling examined obesity as a risk factor for myocardial infarction and death. Obesity proved to be such a risk factor, but above all in combination with other risk factors like diabetes, high blood pressure, high blood lipids, and not least smoking. Fully 16 percent of the obese individuals had none of these risk factors, and for them the risk of having a myocardial infarction was not heightened.
The second study deals with obesity in combination with various occupations and marital status. The study shows that obesity, discounting other risk factors, increased the risk of myocardial infarction only for single men in the working class or in self-employment. Just living alone entailed a considerably heightened myocardial infarction risk for overweight men.
“My conclusion is that overweight people should not be seen as a homogeneous group. Obesity is a health risk for many people, but in no way for everybody. If you wish to lower the risk of people having myocardial infarction, you should therefore concentrate on the most vulnerable groups and not attempt to get all overweight people to lose weight,” says Susanna Calling.
Linn Kenedy’s dissertation is titled: The importance of BMI and weight-change in patients with coronary artery disease. Susanna Calling’s dissertation is titled Obesity and cardiovascular disease.
Ingela Björck | alfa
Hot cars can hit deadly temperatures in as little as one hour
24.05.2018 | Arizona State University
3D images of cancer cells in the body: Medical physicists from Halle present new method
16.05.2018 | Martin-Luther-Universität Halle-Wittenberg
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...
02.05.2018 | Event News
13.04.2018 | Event News
12.04.2018 | Event News
24.05.2018 | Ecology, The Environment and Conservation
24.05.2018 | Medical Engineering
24.05.2018 | Physics and Astronomy