Topics
12/07/2017
After Gaining Weight, We Eat Too Much and Do Less Exercise
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Contents
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<Prologue>
- Rats don’t get fat from eating too much
- Example of not enough exercise after getting fat
Prologue
"The experts who say that we get fat because we overeat or we get fat as a result of overeating - the vast majority - are making the kind of mistake that would (or at least should) earn a failing grade in a high-school science class.
They're taking a law of nature that says absolutely nothing about why we get fat and a phenomenon that has to happen if we do get fat - overeating - and assuming these say all that needs to be said."
(Gary Taubes. 2011. Why we get fat. New York: Anchor Books, Page 76.)
This is the foundation I started writing my blog on. I’m sure that there are at least a few researchers in the world who think the same way as I do.
Even if someone insisted that, “the Earth is going around the Sun” in the sixteenth or seventeenth century where "geocentric theory" was the prevailing thought, no one would have believed him.
Many should have argued that, “if the Earth is going around the sun, our heads should go around, too.” However, now, it’s common sense that the Earth is going around the sun.
In the same way, many might not believe me when I say, “people can gain weight by intestinal starvation and it is the fundamental cause of being overweight.” However, I believe it’s the truth.
１．Rats don’t get fat from eating too much
It is said that, “eating too much and not enough exercise are the causes of gaining weight,” but here is an interesting experiment that is related to it.
"In the early 1970s, a young researcher at the University of Massachusetts named George Wade set out to study the relationship between sex hormones, weight, and appetite by removing the ovaries from rats (females,obviously) and then monitoring their subsequent weight and behavior.
The effects of the surgery were suitably dramatic: the rats would begin to eat voraciously and quickly become obese.The rat eats too much, the excess calories find their way to the fat tissue, and the animal becomes obese. This would confirm our preconception that overeating is responsible for obesity in humans as well.
But Wade did a revealing second experiment, removing the ovaries from the rats and putting them on a strict postsurgical diet. (*snip*) The rats, postsurgery, were only allowed the same amount of food they would have eaten had they never had the surgery.
What happened is not what you'd probably think. The rats got just as fat, just as quickly. But these rats were now completely sedentary. They moved only when movement was required to get food. (*snip*)
The way Wade explained it to me, the animal doesn't get fat because it overeats, it overeats because it's getting fat. The cause and effect are reversed.
(*snip*)
The evidence that fat tissue is carefully regulated, not just a garbage can where we dump whatever calories we don't burn, is incontrovertible.(*snip*)
Those who get fat do so because of the way their fat happens to be regulated and that a conspicuous consequence of this regulation is to cause the eating behavior (gluttony) and the physical inactivity (sloth) that we so readily assume are the actual causes."
(Taubes. Why we get fat. Page 89-90, 93-4.)
＜1970s＞
Words of Bruce Birstrian who conducted a treatment of a low-calorie diet (600kcal/day) to thousands of obese patients at Harvard University of Medicine.
"Undereating isn't a treatment or cure for obesity; it's a way of temporarily reducing the most obvious symptom. And if undereating isn't a treatment or a cure , this certainly suggests that overeating is not a cause."
(Taubes. Why we get fat. Page 39.)
My experience is a little different from the rats’ story, but I want to tell of my experience that I gained weight not because of eating more.
When I was very thin, under forty kilograms, I couldn’t eat a lot since my stomach always felt heavy. Fatty foods and oily foods were the worst. I tried hard to gain weight, but I couldn’t.
One day, I realized that I could gain weight by eating only easy-to-digest foods (mainly carbs and a little meat) and experiencing being hungry for hours. So, I tried to eat light meals for breakfast and lunch, and I tried not to eat vegetables and fat very much until dinner. By doing so, I gradually gained weight. And when I weighed about fifty kilograms, I had more muscle and less discomfort in my stomach. I was able to eat more than before.
Those who didn’t know my experience told me, “You’re gaining weight because you’re eating more,” but that wasn’t true.
After my body adjusted to my new eating plan, I gained weight little by little by eating. As I gained weight, I gradually gained more muscle and my appetite increased. As a result, I was able to eat more than before. So, the reality was the other way around.
▽Maybe it’s easier for you to imagine with an extreme example.
Let’s say there is a big man who is three meters tall and weighs two-hundred-fifty kilograms. If he eats five times as much food as we do, we would not think that he has grown big because he eats so much. Rather, we would think, "He is able to eat that much because he is so big.”
"Just prior to the Second World War, European medical researchers argued that it is absurd to think about obesity as caused by overeating, because anything that makes people growーwhether in height or in weight, in muscle or in fatーwill make them overeat.
Children, for example, don't grow taller because they eat voraciously and consume more calories than they expend. They eat so muchーovereatーbecause they're growing."
(Taubes. Why we get fat. Page 9.)
２．Example of not enough exercise after getting fat
"Some people find it hard to get their head round the fact that aerobic exercise is not particularly effective for weight loss, even when faced with all the facts.
One reason for this is our experience of seeing physically fit and active individuals who are clearly lean.
Look at any elite long-distance runner or Tour de France cyclist and you're probably getting a glimpse of what it's like to have a single-digit body fat percentage. The automatic thought process is that exercise causes leanness.
However, could it that individuals who are naturally lean are simply more likely to end up as elite long-distance runners or cyclists? In other words, might their natural leanness cause certain people to be more active, rather than the other way round?
There's actually some evidence for this. In one piece of research, the relationship between physical activity and body fatness in children over a 3-year period was assessed. It was found that the more sedentary children were, the more fat they carried.
This is all to be expected, but because the study was conducted over a prolonged period the researchers were able to gauge whether sedentary behaviour preceded weight gain.
Actually, it did not. In reality, children accumulated fat first, and then became more sedentary.
The authors noted that this finding 'may explain why attempts to tackle childhood obesity by promoting PA [physical activity] have been largely unsuccessful'. "
(Jone Briffa. 2013. Escape the Diet Trap. London: Fourth Estate, Pages 223-4.)
I agree with this opinion, but I’d like to add my own opinion.
As Dr. Briffa said, I think it’s reasonable to think those who are slim aim to be marathon athletes or soccer players, etc. They at least know that they can eat a lot and not get fat. So they will eat whatever they want without hesitation, won’t they?
In other words, by eating balanced foods every meal, intestinal starvation doesn’t happen —by that, I mean their set-point for body weight doesn’t change—and they keep their current weight while getting a little more muscle.
On the other hand, when people stay at home, spending time relaxing with a book or watching television, or when doing office work or light physical labor, don’t they tend to eat less or lighter meals?
Sometimes, they may eat only light meals such as hamburgers, hot-dogs, or instant noodles for lunch. Since they don’t exercise, they don’t pay attention to eating balanced and nutritious meals.
If their diet leans toward easily digestible carbs and some protein and they are experiencing being hungry for hours, the intestinal starvation mechanism may occur and their set-point weight will go up. They end up gaining more weight.
To sum up, I’d like to say that not enough exercise or laziness won’t directly cause people to get fat. The intensity and amount of physical activity will affect the amount of food you eat as well as food choices.