Consuming excess calories increases body fat, regardless of how many calories come from protein. High-protein diets do affect energy expenditure and storage of lean body mass, just not body fat storage.
To evaluate the effects of overconsumption of low-, normal-, and high-protein diets on weight gain, researchers conducted a single-blind, randomized controlled trial of 25 healthy, weight-stable adults in an inpatient metabolic unit in Baton Rouge, La. Patients were ages 18 to 35 with a body mass index between 19 and 30. The study was headed by George A. Bray, MD, MACP.
After consuming a weight-stabilizing diet for 13 to 25 days, participants were randomized to diets containing 5% of energy from protein (low protein), 15% (normal protein) or 25% (high protein). Only the kitchen staff who supervised participants while they were eating knew the assignments. There was no prescribed exercise, and alcohol and caffeine were restricted.
Patients were Read more »
*This blog post was originally published at ACP Internist*
I usually choose not to write about the “new new scientific thing” that gets picked up by the press, because early research is usually not reproducible and good science takes a long time to validate as true. But since we know that mice and rats that are kept on low-calorie diets live 30% longer (and healthier) than their fat cohorts, I was interested in a new research compound, SRT-1720, that was shown to protect obese mice from diseases of obesity. Fat mice lived 44% longer if they were given this drug.
The “designer” drug works by Read more »
*This blog post was originally published at EverythingHealth*
Journalist Gary Taubes created a stir in 2007 with his impressive but daunting 640-page tome Good Calories, Bad Calories. Now he has written a shorter, more accessible book Why We Get Fat: And What to Do About It to take his message to a wider audience. His basic thesis is that:
- The calories-in/calories-out model is wrong.
- Carbohydrates are the cause of obesity and are also important causes of heart disease, type 2 diabetes, cancer, Alzheimer’s, and most of the so-called diseases of civilization.
- A low-fat diet is not healthy.
- A low-carb diet is essential both for weight loss and for health.
- Dieters can satisfy their hunger pangs and eat as much as they want and still lose weight as long as they restrict carbohydrates.
He supports his thesis with data from the scientific literature and with persuasive theoretical arguments about insulin, blood sugar levels, glycemic index, insulin resistance, fat storage, inflammation, the metabolic syndrome, and other details of metabolism. Many readers will come away convinced that all we need to do to eliminate obesity, heart disease and many other diseases is to get people to limit carbohydrates in their diet. I’m not convinced, because I can see some flaws in his reasoning. Read more »
*This blog post was originally published at Science-Based Medicine*
It’s the time of the year when dietary temptations lurk around every corner of the hospital. And since completely abstaining is not always possible, the best antidote for this holiday deluge of inflammation is obvious: Exercise.
No doubt, within the boundaries of common sense, all exercise is good. But is there a best time of day to exercise?
Tara Parker-Pope’s New York Times piece suggests that the most “productive” time of day to exercise is before breakfast. In concisely reviewing a Belgian exercise physiology study, Ms. Parker-Pope points out that, in blunting the undesirable effects of a high fat and sugar diet, pre-breakast (fasting) exercise was metabolically more efficient than was exercise later in the day. That’s really good news for the overweight middle-agers who consistently say: “I really don’t eat very much. I must have a slow metabolism.”
Scientific studies are one thing, but are they validated in the court of real life? Read more »
*This blog post was originally published at Dr John M*
Obesity doesn’t stand a chance against Dr. Jim Levine, one of the prestigious presenters at Mayo Clinic’s Transform 2010 conference last week. Dr. Levine’s fascinating research focuses on helping people understand obesity, weight reduction, and Non-Exercise Activity Thermogenesis (NEAT) — the idea that expending calories through the activities of daily living is more important for calorie burning than exercise is.
Dr. Levine’s ”Treadmill Desk” has won more than 50 national and international awards in science, including the Judson Daland prize from the American Philosophical Society, the Invention of the Future Award from NASA, and the Innovation Award at the World Fair. The “Walkstation” is now a product of Steelcase.
Dr. Levine’s work has been highlighted nationally around the world, and he has produced documentary films with the BBC, ABC, and CNN. His Walkstation has been featured in The New York Times, his vision of a future where office people walk at work in USA Today, and his Treadmill Desk tested live on Good Morning America. Read more »