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A team of researchers walked every street in 228 census tracts around Los Angeles and New Orleans and recorded every outdoor ad they saw. Another group surveyed 2,881 residents of the same census tracts by telephone, paying them to report their height, weight and other information. After analyzing this hard-won data, the authors conclude: “For every 10 percent increase in food advertisements, the odds of being obese increased by 5 percent.” That is, areas with more outdoor food ads have a higher proportion of obese people than ones with fewer ads.

The problem is that their policy recommendations rest on a crucial but unjustified assumption: that any link between obesity and advertising occurs because more advertising causes higher rates of obesity. But the study at hand showed only an association: people living in areas with more food ads were more likely to be obese than people living in areas with fewer food ads. To be fair, the researchers correctly note that additional steps would be needed to prove that food ads cause obesity. But until those steps are taken, talk of restricting ads is premature. In fact, it is easy to imagine how the causation could run the opposite way (something the article did not mention): If food vendors believe obese people are more likely than non-obese people to buy their products, they will place more ads in areas where obese people already live. Suppose we counted ads for fitness-oriented products like bicycles and bottled water, and found more of those ads in places with less obesity. Would it then be wise anti-obesity policy to subsidize such ads? Or would the smarter conclusion be that the fitness companies suspect that the obese are less likely than the fit to buy their products?

When we seek to base policy on evidence, we must remember that not all “evidence” is created equal. Taken at face value, the study on ads and obesity provides some indication that the two are linked, but no evidence that food ads cause obesity. The fact that the causal conclusion may coincide with a moral belief — that it is wrong to tempt people who overeat by showing them ads for food — does not make it valid.

It's not that it's impossible for governments to hold down obesity; France, which had rapidly rising childhood obesity early this century, instituted an aggressive set of public-health interventions including school-based food and exercise shifts, nurse assessments of overweight kids, visits to families where overweight kids were identified, and so forth. Their childhood obesity rates stabilised at a fraction of America's.

The problem isn't that it's not possible; rather, it's that America is incapable of doing it.

America's national governing ideology is based almost entirely on the assertion of negative rights, with a few exceptions for positive rights and public goods such as universal elementary education, national defence and highways. But it's become increasingly clear over the past decade that the country simply doesn't have the political vocabulary that would allow it to institute effective national programmes to improve eating and exercise habits or culture. A country that can't think of a vision of public life beyond freedom of individual choice, including the individual choice to watch TV and eat a Big Mac, is not going to be able to craft public policies that encourage people to exercise and eat right. We're the fattest country on earth because that's what our political philosophy leads to. We ought to incorporate that into the way we see ourselves; it's certainly the way other countries see us.

The Lancet, projecting that three-fourths of adults in the United States will be overweight or obese by 2020.

Colorado, the least fat state in 2011, would be the heaviest had they reported their current rate of obesity 20 years ago. That’s how much we’ve slipped.

Annual medical costs for an obese adult are as much as $6,500 more, on average, than for healthy-weight adults.

A longitudinal study, published Thursday in the journal Diabetologia, followed 5,189 people over 10 years and found that people with high blood sugar had a faster rate of cognitive decline than those with normal blood sugar

In other words, the higher the blood sugar, the faster the cognitive decline.

“Currently, dementia is not curable, which makes it very important to study risk factors.”

Regulators on Friday said a new version of a popular diabetes medicine could be sold as a weight-loss drug in the U.S.

In company-funded studies, participants taking Wegovy had average weight loss of 15%, about 34 pounds (15.3 kilograms). Participants lost weight steadily for 16 months before plateauing.

"With existing drugs, you're going to get maybe 5% to 10% weight reduction, sometimes not even that,"

About one-third of Americans older than 65 now live alone, and half of those over 85 do. People in poorer health — especially those with mood disorders like anxiety and depression — are more likely to feel lonely. Those without a college education are the least likely to have someone they can talk to about important personal matters.

Loneliness can accelerate cognitive decline in older adults, and isolated individuals are twice as likely to die prematurely as those with more robust social interactions. These effects start early: Socially isolated children have significantly poorer health 20 years later, even after controlling for other factors. All told, loneliness is as important a risk factor for early death as obesity and smoking.

The loneliness of older adults has different roots — often resulting from family members moving away and close friends passing away. As one senior put it, “Your world dies before you do.”

Outside of beverages, there are few clear trends. Experts who have examined the data say the reductions do not mean that Americans are flocking to farmer’s markets and abandoning fast food. Consumption of fruits and vegetables remains low; consumption of desserts remains high. Instead, people appear to be eating a little less of everything. Although consumption in nearly every category has been “cut some,” said Mr. Popkin, “the food part of our diet is horrendous and remains horrendous.”

The calorie reductions are seen across nearly every demographic group, but not equally. White families have reduced their calorie consumption more than black and Hispanic families. Most starkly, families with children have cut back more than households with adults living alone, further evidence, experts say, that the public health emphasis on childhood obesity is driving the changes.

Perhaps the biggest caveat to the trend is that it does not appear to extend to the very heaviest Americans. Among the most overweight people, weight and waist circumference have all continued rising in recent years.

How did experts get it so wrong?

the primary problem is that nutrition policy has long relied on a very weak kind of science: epidemiological, or “observational,” studies in which researchers follow large groups of people over many years. But even the most rigorous epidemiological studies suffer from a fundamental limitation. At best they can show only association, not causation.

Instead of accepting that this evidence was inadequate to give sound advice, strong-willed scientists overstated the significance of their studies.

we fail to notice that food marketers use synthetic vitamins to sell unhealthful products. Not only have we become dependent on these synthetic vitamins to keep ourselves safe from deficiencies, but the eating habits they encourage are having disastrous consequences on our health.

vitamins spread from the labs of scientists to the offices of food marketers, and began to take on a life of their own.

Nutritionists are correct when they tell us that most of us don’t need to be taking multivitamins. But that’s only because multiple vitamins have already been added to our food.

Why would anyone continue to use recreational drugs despite the medical consequences and social condemnation? What makes someone eat more and more in the face of poor health?

modern humans have designed the perfect environment to create both of these addictions.

Drug exposure also contributes to a loss of self-control. Dr. Volkow found that low D2 was linked with lower activity in the prefrontal cortex, which would impair one’s ability to think critically and exercise restraint

In 2014, the American Academy of Pediatrics recommended that middle and high school start no earlier than 8:30 a.m. And just this week, California was the first state to pass into law school start times of no earlier than 8 a.m. for middle schools and 8:30 a.m.

The research is clear that sleep is critical for healthy functioning and development at all points across the lifespan. Sleep disturbances have been linked to a host of outcomes including more difficulty concentrating and learning new material, lower academic performance, higher rates of obesity, increased inflammation, higher mortality, and compromised psychological health.

As a result of the mismatch between biological changes and earlier school start times, teenagers are often unable to sleep the recommended 8-10 hours per night that is recommended for this age. In fact, national studies show that teenagers are one of the most sleep-deprived groups in the country with only 15 percent getting the recommended hours of sleep.

In his brilliant encyclopedia of “critical studies,” James Lindsay explains the core argument: “Like disability studies, fat studies draws on the work of Michel Foucault and queer theory to argue that negative attitudes to obesity are socially constructed and the result of systemic power that marginalizes and oppresses fat people (and fat perspectives) and of unjust medicalized narratives in order to justify prejudice against obese people.

Fatness — like race or gender — is not grounded in physical or biological reality. It is a function of systemic power. The task of fat studies is to “interrogate” this oppressive power and then dismantle it.

take the polar opposite position: Fatness is an unhealthy lifestyle that can be stopped by people just eating less and better. We haven’t always been this fat, and we should take responsibility for it, and the physical and psychological damage it brings. Some level of stigma is thereby inevitable, and arguably useful. Humans are not healthy when they are badly overweight; and the explosion in obesity in America has become a serious public-health issue.

This is what poverty looked like in the Great Depression…

This is what poverty looks like today…

For most of recorded history, fat was revered as a sign of health and prosperity. Plumpness was a status symbol. It showed that you did not have to engage in manual labor for your sustenance. And it meant that you could afford plentiful quantities of food.

A FUNNY thing has happened in the United States over the last few decades. Men’s average testosterone levels have been dropping by at least 1 percent a year

Testosterone appears to decline naturally with aging, but internal belly fat depresses the hormone further, especially in obese men. Drugs like steroids and opiates also lower testosterone, and it’s suspected that chemicals like bisphenol A (or BPA, commonly found in plastic food containers) and diseases like Type 2 diabetes play a role as well.

Clinical testosterone deficiency, which is variously defined as lower than 220 to 350 nanograms of testosterone per deciliter of blood serum, can cause men to lose sex drive and fertility. Their bone density often declines, and they may feel tired and experience hot flashes and sweats.

If you want to know what a political party really stands for, follow the money

Major donors, however, generally have a very good idea of what they are buying, so tracking their spending tells you a lot.

what do contributions in the last election cycle say? The Democrats are, not too surprisingly, the party of Big Labor (or what’s left of it) and Big Law: unions and lawyers are the most pro-Democratic major interest groups.

A 2010 study in the journal Social Psychological and Personality Science found that the percentage of college students exhibiting narcissistic personality traits, based on their scores on the Narcissistic Personality Inventory, a widely used diagnostic test, has increased by more than half since the early 1980s, to 30 percent. In their book “Narcissism Epidemic,” the psychology professors Jean M. Twenge and W. Keith Campbell show that narcissism has increased as quickly as obesity has since the 1980s. Even our egos are getting fat.

This is a costly problem. While full-blown narcissists often report high levels of personal satisfaction, they create havoc and misery around them. There is overwhelming evidence linking narcissism with lower honesty and raised aggression.

narcissism isn’t an either-or characteristic. It’s more of a set of progressive symptoms (like alcoholism) than an identifiable state (like diabetes). Millions of Americans exhibit symptoms, but still have a conscience and a hunger for moral improvement. At the very least, they really don’t want to be terrible people.

A few years ago, when my girls were in the second and third grades, they raved about the dance breaks they would occasionally have during the school day.

My kids' teachers were certainly not alone. More teachers are incorporating some form of movement into the school day, especially as the research is pretty clear: Physical activity in school leads to better cognitive performance and fewer behavioral issues, not to mention cutting down on stress and anxiety.

It all seems like a no-brainer, especially as research shows that childhood obesity seems to be getting worse. As former first lady Michelle Obama advocated, let's get our kids to move.The challenge, though, is persuading school administrations to consistently make time for physical activity when they are pressed to meet stringent academic requirements and find the money to pay for some of the training.

In an environment where it is expected -- and sometimes even seems trendy -- to not get enough sleep, it has been hard to remain steadfast with my habits.

The National Heart, Lung, and Blood Institute recommends 7-8 hours of sleep per night for adults, with some variation from person to person. Insufficient sleep is associated with numerous chronic conditions including diabetes, cardiovascular disease, obesity, and depression.

getting sufficient sleep is not a luxury -- it is a necessity -- and should be thought of as a 'vital sign' of good health."

When you think of heart attacks, you might assume the most common causes are smoking, high cholesterol, or obesity. Mental health issues probably don't spring to mind.

Depression—which for this study, was determined by a checklist of mood symptoms, including anxiety and fatigue

“depressed mood and exhaustion holds a solid middle position within the concert of major cardiovascular risk factors.”

Recent research indicates that only about half of perceived friendships are mutual. That is, someone you think is your friend might not be so keen on you. Or, vice versa, as when someone you feel you hardly know claims you as a bestie.

“The notion of doing nothing but spending time in each other’s company has, in a way, become a lost art,” replaced by volleys of texts and tweets, Mr. Sharp said. “People are so eager to maximize efficiency of relationships that they have lost touch with what it is to be a friend.”

It’s a concern because the authenticity of one’s relationships has an enormous impact on one’s health and well-being.