Obesity : Killer combination of fat, sugar and salt

In 2010, Guardian published an article written by Food and Drug Administration
(FDA) commissioner Dr. David Kessler. This article is no longer on Guardian since their copyright on it has expired.  A simple googling will still reveal some other sources. SOME EXCERPTS:

THE LIE

For years I wondered why I was fat. I lost weight, gained it back, and lost it again – over and over and over. I owned suits in every size. As a former commissioner of the FDA (the US Food and Drug Administration), surely I should have the answer to my problems. Yet food held remarkable sway over my behaviour.

MORE LIES

The latest science seemed to suggest being overweight was my destiny. I was fat because my body’s “thermostat” was set high. If I lost weight, my body would try to get it back, slowing down my metabolism till I returned to my predetermined set point.

SOME FACTS

But this theory didn’t explain why so many people, in the US and UK in particular, were getting significantly fatter. For thousands of years, human body weight had stayed remarkably stable. Millions of calories passed through our bodies, yet with rare exceptions our weight neither rose nor fell. A perfect biological system seemed to be at work. Then,
in the 80s, something changed.

During the past 20 years there has been a dramatic increase in obesity in the  United States. What had happened to add so many millions of  pounds to so many millions of people? Certainly food had become more  readily available, with larger portion sizes, more chain restaurants and a culture that promotes out-of-home eating. But having food available doesn’t mean we  have to eat it. What has been driving us to overeat?  

A REASON

“Higher sugar, fat and salt make you want to eat more.” I had read this in scientific literature, and heard it in conversations with  neuroscientists and  psychologists. But here was a leading food  designer, a Henry Ford of  mass-produced food, revealing how his industry operates. To protect his business, he did not want to be identified, but he was remarkably candid, explaining how the food industry creates dishes to hit what he  called the “three points of the compass”. 

The ultra-high levels of fat make food easier to chew, whereby faster bypasses normal feelings of satiation. People addicted to the such foods tend to  gorge. Sugar, fat and salt make a food compelling. They stimulate  neurons, cells that trigger the brain’s reward system and release dopamine, a  chemical that motivates our behaviour and makes us want to eat more. Many of us have what’s called a “bliss point”, at which we get the greatest  pleasure from sugar, fat or salt. Combined in the right way, they make a product  indulgent, high in “hedonic value”.

So when McDonald ad says, “I am loving it”. For once, they are not lying.

****

During the past two decades, there has been an explosion in our ability to access and afford what scientists call highly “palatable” foods. *By palatability, they don’t just mean it tastes good: they are referring primarily to its capacity to  stimulate the appetite. * Restaurants sit at the epicentre of this explosion, along with an ever-expanding range of dishes that hit these three compass points. Sugar, fat and salt are either loaded into a core ingredient (such as  meat, vegetables, potato or bread), layered on top of it, or both. Deep-fried tortilla chips are an example of loading – the fat is contained in the chip itself. When it is smothered in cheese, sour cream and sauce, that’s layering.

****

Combined in the right way, sugar, fat and salt act like a drug. They stimulate neurons, cells that trigger the brain’s reward system and release dopamine, a chemical that makes us want to eat more. Take Kentucky Fried Chicken. My source called it “a premier example” of putting more fat on our plate. KFC’s approach to battering its food results in “an optimised fat pick-up system”. With its flour, salt, MSG, maltodextrin, sugar, corn syrup and spice, the fried coating imparts flavour that touches on all three points of the compass while giving the consumer the perception of a bargain – a big plate of food at a good price.

****

Initially, KFC meals were built around a whole chicken, with a pick-up surface that contained “an enormous amount of breading, crispiness and brownness on the surface. That makes the chicken look like more and gives it this wonderful oily flavour.” Over time, the company began to realise there was less meat in a chicken nugget compared with a whole chicken, and a greater percentage of fried batter. But the real breakthrough was popcorn chicken. “The smaller the piece of meat, the greater the percentage of fat pick-up,” said the food designer. “Now, we have lots of pieces of a cheaper part of the chicken.” The product has been “optimised on every dimension”, with the fat, sugar and salt combining with the perception of good value virtually to guarantee consumer appeal.

****

This kind of food disappears down our throats so quickly after the first bite that it readily overrides the body’s signals that should tell us, “I’m full.” The food designer offered coleslaw as an example. When its ingredients are chopped roughly, it requires time and energy to chew. But when cabbage and carrots are softened in a high-fat dressing, coleslaw ceases to be “something with a lot of innate ability to satisfy”.

****

This isn’t to say that the food industry wants us to stop chewing altogether. It knows we want to eat a doughnut, not drink it. “The key is to create foods with just enough chew – but not too much. When you’re eating these things, you’ve had 500, 600, 800, 900 calories before you know it.” Foods that slip down don’t leave us with a sense of being well fed. In making food disappear so swiftly, fat and sugar only leave us wanting more.

****

According to food consultant Gail Vance Civille, of management consultants Sensory Spectrum, fat is crucial to this process of lubrication, ensuring that a product melts in the mouth. In the past, she says, Americans typically chewed food up to 25 times before it was swallowed; now the average American chews 10 times. “If I have fat in there, I just chew it up and whoosh! Away it goes,” she says. “You have a ‘quick getaway’, a quick melt.

A deep fried Snickers bar, another popular American treat. The Snickers bar, Civille says, is “extraordinarily well engineered”. Unlike many products whose nuts become annoyingly lodged between your teeth, the genius of Snickers is that as we chew, the sugar dissolves, the fat melts and the caramel picks up the peanut pieces, so the entire candy is carried out of the mouth at the same time. “You’re not getting a build-up of stuff in your mouth.”

****

The complexity of the stimulus increases its association to a reward. Elements of that complexity include tastes that are familiar and well liked, and the learning associated with having had a pleasurable experience with the same food in the past. When layers of complexity are built into food, the effect becomes more powerful. Sweetness alone does not account for the full impact of a fizzy drink – its temperature and tingle, resulting from the stimulation of the trigeminal nerve by carbonation and acid, are essential contributors as well.

“The complexity of the stimulus increases its association to a reward,” says Gaetano Di Chiara, an expert in neuroscience and pharmacology at the University of Cagliari in Italy. Elements of that complexity include tastes that are familiar and well liked, especially if not always readily available, and the learning associated with having had a pleasurable experience with the same food in the past.

****

In theory there’s a limit to how much stimulation rewarding foods can
generate. We are supposed to habituate – to neuroadapt. When Di Chiara
gave animals a cheesy snack called Fonzies, the levels of dopamine in
their brains increased. Over time, habituation set in, dopamine levels
fell and the food lost its capacity to activate their behaviour.

But if the stimulus is powerful enough, novel enough or administered
intermittently enough, the brain may not curb its dopamine response.
Desire remains high. We see this with cocaine use, which does not
result in habituation. Hyperpalatable foods alter the landscape of the
brain in much the same way.

I asked Di Chiara to study what happens after an animal is repeatedly exposed to a high-sugar, high-fat chocolate drink. When he’d completed his experiment, he sent me an email with “Important results!!!!” in the subject line. *He had shown that dopamine response did not diminish over time with the chocolate drink. There was no habituation.

Novelty also impedes habituation, and intermittency is another driver. Give an animal enough sugar-laden food, withdraw it for the right amount of time, then provide it again in sufficient quantities, and dopamine levels may not diminish.

Rewarding foods are rewiring our brains. As they do, we become more sensitive to the cues that lead us to anticipate the reward. In that circularity lies a trap: we can no longer control our responses to highly palatable foods because our brains have been changed by the foods we eat.

I wanted to know how much the industry understood about how the food we eat affects us; about what I have termed “conditioned hypereating” – “conditioned” because it becomes an automatic response to widely available food, “hyper” because the eating is excessive and hard to control. I turned to Joseph Stiglitz, a Nobel laureate in economics.

“Does the industry know that what it feeds us gets us to eat more?” I asked. The industry has jacked up what works for it,” Stiglitz said. “The learning is evolutionary.” Practical experience has been its guide – it does not need lab rats when it can try out its ideas on humans. Its decision-makers do not have to analyse human brain circuitry to discover what sells.” There’s still a lot we don’t know about the relationship between the dopamine-driven motivational system and our behaviour in the presence of rewarding foods. But we do know that foods high in sugar, fat and salt are altering the biological circuitry of our brains. We have scientific techniques that demonstrate how these foods – and the cues associated with them – change the connections between the neural circuits and their response patterns.
 
****

XXXXXlearned a basic lesson: make enticing food easily and constantly available, keep it novel, and people will keep coming back for more. With food available in almost any setting, “the number of cues, the number of opportunities”* to eat have increased, while the barriers to consumption have fallen, says David Mela, senior scientist of weight management at the Unilever Health Institute. “The environmental stimulus has changed.”

Of course, when food is offered to us, we’re not obliged to eat it. When it’s on the menu, we don’t have to order it. But this takes more than willpower. As an individual, you can practise eating the food you want in a controlled way. As a society, we can identify the forces that drive overeating and find ways to diminish their power. That’s what happened with the tobacco industry: attitudes to smoking shifted. Similar changes could be brought about in our attitudes to food – by making it mandatory for restaurants to list calorie counts on their menus; by clear labelling on food products; by monitoring food marketing. But until then few of us are immune to the ubiquitous presence of food, the incessant marketing and the cultural assumption that it’s acceptable to eat anywhere, at any time.

Call it the “taco chip challenge” – the challenge of controlled eating  in the face of constant food availability. “Forty years ago, you might face the social equivalent of that taco chip challenge once a month. Now you face it every single day,” Mela said. “Every single day and  every single place you go, those foods are there, those foods are cheap, those foods are readily available for you to engage in. There is constant, constant opportunity.”

UPDATE :

In U.S. McDonalds was asked to put calories in its menu which it  did. There has been some hostility towards it in government. http://www.guardian.co.uk/business/2010/sep/14/us-health-ad-targets-m…  Now, McD is aiming towards India and other countries where lack of knowledge and pressure to emulate Western culture is significantly high. India media has taken a agnostic view over it alltogether. Partly due to ‘no one care’, and mostly due to ‘advertisements’ revenues.

END NOTES :
[1] A few indian newspaper have devoted space for food related issues.
Though there are not mainstream. I am a reader of Hindu so my knowledge about other papers are limited. Hindu has been writing about ‘salt intake’
http://www.thehindu.com/opinion/editorial/article62167.ece  which increases blood pressure and causes heart attacks.

[2] In India, emphasis of public debate has been on ‘food security’. Nothing
much is available in learned journal about the ‘food policies of gov. of India’.


Dilawar

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Author: Dilawar

Graduate Student at National Center for Biological Sciences, Bangalore.

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