Yesterday, we discovered that diet, more
so than physical activity, is responsible for gaining and losing weight. Not that I or any of us ever think about calories...
but today’s follow-up cites a fun and well-written insight into foods and calories from the Scientific American web site.
This holds for industrial processing: eating white bread and cheese wiz asks
little of our teeth or our digestive system to give us calories. In fact, eating an equal portion of whole
wheat bread and cheddar cheese actually provides you with 10% fewer calories because digesting the whole foods requires some energy.
Nowadays, many of us are
trying to reduce the number of calories we consume, yet maximizing caloric
intake through food processing (mainly cooking) may have played a huge role in our
evolution. In the age before fire, our paleo
ancestors ate their food raw and would have craved excess calories.
With a few exceptions, we as
a species have thrived in large part because of our combined preference for
cooked food and our unique ability to make it on demand.**
For more information on these cooking studies, you might want to consult the Harvard University researchers. Rachel Carmody and her collaborators studied the mice that preferred and grew heavier on cooked and pounded meat and sweet potatoes. Richard Wrangham’s new book makes the case that the ability to harness fire and cook food allowed our brains to grow and the digestive tract to shrink.

The main newsflash of this article is that the number of calories we absorb from a particular food product varies, for a number
of reasons.
Why calorie counts are only guidelines
You and I, for example, will absorb calories from a given type of food (such as a tomato or a lamb chop) differently,
depending on the amount of time we cooked the food, the microbes living in our respective
guts, and even our ancestries (apparently, Russian intestines are about five feet longer than those of Italians
– I always knew that someone named Palminteri just shouldn’t be eating beets!).
Cooking and pounding meat makes it easier to digest and absorb the
calories from it. Same for
veggies. Processing our food in the kitchen does some of the work that our teeth, stomachs, and intestines would
otherwise have to do. To put it bluntly, as the article's author Rob Dunn, a biologist at North Carolina State University, states,
“If you want more calories, cook, pound and otherwise predigest your food.”

We share nutrients from food
with trillions of microbes, which live in our guts and help to break down many
compounds our own bodies can’t. The calories
lost through this sharing process, as well as those used by our immune systems to
fight off disease from food contaminants, are not considered in the calories attributed
to specific foods or published on food labels.
Cooking counts for calories

According to Harvard
biologist Richard Wrangham and others, cooking food may have allowed early humans
to extract more energy from their food.
By spending less time chewing tough raw food, they would have had more
time to develop agriculture, tools, and social networks (which back then meant actual
talking). The easier digestion and better calorie absorption may have also
contributed to the development 1.8 million years ago of larger brains – which consume substantial amounts of energy – and
relatively smaller guts, jaws, and teeth.

**However, raw and less-cooked foods do tend to have more nutrients and minerals, so, like exercise, they are good for us beyond their impact on our weight. And as we learned yesterday, one third of Americans are considered obese: we humans now consume too many calories, and too many of those calories are of low quality. |
For more information on these cooking studies, you might want to consult the Harvard University researchers. Rachel Carmody and her collaborators studied the mice that preferred and grew heavier on cooked and pounded meat and sweet potatoes. Richard Wrangham’s new book makes the case that the ability to harness fire and cook food allowed our brains to grow and the digestive tract to shrink.
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