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Everything You Know About Obesity Is Wrong - The Huffington Post

Doctors have shorter appointments with fat patients and show less emotional rapport in the minutes they do have. Negative words—“noncompliant,” “overindulgent,” “weak willed”—pop up in their medical histories with higher frequency. In one study, researchers presented doctors with case histories of patients suffering from migraines. With everything else being equal, the doctors reported that the patients who were also classified as fat had a worse attitude and were less likely to follow their advice. And that’s when they see fat patients at all: In 2011, the Sun-Sentinel polled OB-GYNs in South Florida and discovered that 14 percent had barred all new patients weighing more than 200 pounds.

Take a Vacation From Exercise? Your Body May Not Thank You - The New York Times

Like the adults in the other study, these older volunteers quickly developed worse blood sugar control during their two weeks of barely moving. Insulin resistance climbed. Some developed changes in muscle tissue indicating that they might soon begin to lose muscle mass, and a few had to be removed from the study because they had edged into full-blown Type 2 diabetes after becoming inactive. For most of the men and women who remained in the experiment, their undesirable metabolic changes were not fully reversed after two weeks of moving about again.

A Smartphone App Reveals Erratic Diurnal Eating Patterns in Humans that Can Be Modulated for Health Benefits. - PubMed - NCBI

The daily intake duration (95% interval) exceeded 14.75 hr for half of the cohort. When overweight individuals with >14 hr eating duration ate for only 10-11 hr daily for 16 weeks assisted by a data visualization (raster plot of dietary intake pattern, "feedogram") that we developed, they reduced body weight, reported being energetic, and improved sleep. Benefits persisted for a year.

Time-Restricted Feeding Is a Preventative and Therapeutic Intervention against Diverse Nutritional Challenges - ScienceDirect

Here we tested TRF in mice under diverse nutritional challenges. We show that TRF attenuated metabolic diseases arising from a variety of obesogenic diets, and that benefits were proportional to the fasting duration. Furthermore, protective effects were maintained even when TRF was temporarily interrupted by ad libitum access to food during weekends, a regimen particularly relevant to human lifestyle. Finally, TRF stabilized and reversed the progression of metabolic diseases in mice with preexisting obesity and type II diabetes. We establish clinically relevant parameters of TRF for preventing and treating obesity and metabolic disorders, including type II diabetes, hepatic steatosis, and hypercholesterolemia.

Time-Restricted Feeding without Reducing Caloric Intake Prevents Metabolic Diseases in Mice Fed a High-Fat Diet - ScienceDirect

To test whether obesity and metabolic diseases result from HFD or disruption of metabolic cycles, we subjected mice to either ad lib or time-restricted feeding (tRF) of a HFD for 8 hr per day. Mice under tRF consume equivalent calories from HFD as those with ad lib access yet are protected against obesity, hyperinsulinemia, hepatic steatosis, and inflammation and have improved motor coordination. The tRF regimen improved CREB, mTOR, and AMPK pathway function and oscillations of the circadian clock and their target genes' expression. These changes in catabolic and anabolic pathways altered liver metabolome and improved nutrient utilization and energy expenditure. We demonstrate in mice that tRF regimen is a nonpharmacological strategy against obesity and associated diseases.

Strategic fasting improves race times

In this particular study, both groups actually consumed the same amount of carbohydrates, but the sleep-low group ate all of theirs between their morning and afternoon sessions while the control group also had carbs after their second workout. Both groups completed a test triathlon to assess their fitness and then a second one three weeks later to determine the effectiveness of the training method. The sleep-low group had improved their running times on the 10-km segment by an average of 75 seconds while the control group showed no improvement. The sleep low athletes also lost about 3 pounds of body fat while the control group stayed the same.

Our muscles measure the time of day -- ScienceDaily

Biochemistry Department of the Faculty of Sciences, UNIGE, who codirected the study in Geneva with colleague Charna Dibner, from the Department of Internal Medicine Specialties, from the Faculty of Medicine, UNIGE. "As the combination of lipids varied substantially from one individual to another, we needed further evidence to corroborate these findings," he explains. In a second step, the researchers switched to an in-vitro experiment. They cultivated human muscle cells and artificially synchronised them in the absence of a master clock, using a signal molecule normally secreted in the body. The researchers observed a periodic variation in the cell's lipid composition, similar to what they noticed in human subjects. But when they disrupted the clock mechanism by inhibiting the responsible genes, the periodically changing variations in the lipids were mostly lost.

The Benefits of Exercising Before Breakfast - The New York Times

At the end, the nonexercising group was, to no one’s surprise, super-sized, having packed on an average of more than six pounds. They had also developed insulin resistance — their muscles were no longer responding well to insulin and weren’t pulling sugar (or, more technically, glucose) out of the bloodstream efficiently — and they had begun storing extra fat within and between their muscle cells. Both insulin resistance and fat-marbled muscles are metabolically unhealthy conditions that can be precursors of diabetes. The men who ate breakfast before exercising gained weight, too, although only about half as much as the control group. Like those sedentary big eaters, however, they had become more insulin-resistant and were storing a greater amount of fat in their muscles. Only the group that exercised before breakfast gained almost no weight and showed no signs of insulin resistance. They also burned the fat they were taking in more efficiently. “Our current data,” the study’s authors wrote, “indicate that exercise training in the fasted state is more effective than exercise in the carbohydrate-fed state to stimulate glucose tolerance despite a hypercaloric high-fat diet.”

The Best Thing to Eat Before a Workout? Maybe Nothing at All - The New York Times

Most obviously, the men displayed lower blood sugar levels at the start of their workouts when they had skipped breakfast than when they had eaten. As a result, they burned more fat during walks on an empty stomach than when they had eaten first. On the other hand, they burned slightly more calories, on average, during the workout after breakfast than after fasting. But it was the impacts deep within the fat cells that may have been the most consequential, the researchers found. Multiple genes behaved differently, depending on whether someone had eaten or not before walking. Many of these genes produce proteins that can improve blood sugar regulation and insulin levels throughout the body and so are associated with improved metabolic health. These genes were much more active when the men had fasted before exercise than when they had breakfasted.

Run on empty

Gene expression in the adipose tissue differed significantly in the two trials. The expression of two genes, PDK4 and HSL, increased when the men fasted and exercised and decreased when they ate before exercising. The rise in PDK4 likely indicates that stored fat was used to fuel metabolism during exercise instead of carbohydrates from the recent meal. HSL typically increases when adipose tissue uses stored energy to support increased activity, such as during exercise, explained Dylan Thompson, corresponding author of the study. These results reinforce the view that "adipose tissue often faces competing challenges," Thompson wrote. After eating, adipose tissue "is busy responding to the meal and a bout of exercise at this time will not stimulate the same [beneficial] changes in adipose tissue. This means that exercise in a fasted state might provoke more favorable changes in adipose tissue, and this could be beneficial for health in the long term," he noted.