Showing posts with label nutrition. Show all posts
Showing posts with label nutrition. Show all posts

Friday, November 16, 2007

Food subsidies

Drewnowski gave himself a hypothetical dollar to spend, using it to purchase as many calories as he possibly could. He discovered that he could buy the most calories per dollar in the middle aisles of the supermarket, among the towering canyons of processed food and soft drink. (In the typical American supermarket, the fresh foods — dairy, meat, fish and produce — line the perimeter walls, while the imperishable packaged goods dominate the center.) Drewnowski found that a dollar could buy 1,200 calories of cookies or potato chips but only 250 calories of carrots. Looking for something to wash down those chips, he discovered that his dollar bought 875 calories of soda but only 170 calories of orange juice.

As a rule, processed foods are more “energy dense” than fresh foods: they contain less water and fiber but more added fat and sugar, which makes them both less filling and more fattening. These particular calories also happen to be the least healthful ones in the marketplace, which is why we call the foods that contain them “junk.” Drewnowski concluded that the rules of the food game in America are organized in such a way that if you are eating on a budget, the most rational economic strategy is to eat badly — and get fat.

This perverse state of affairs is not, as you might think, the inevitable result of the free market. Compared with a bunch of carrots, a package of Twinkies, to take one iconic processed foodlike substance as an example, is a highly complicated, high-tech piece of manufacture, involving no fewer than 39 ingredients, many themselves elaborately manufactured, as well as the packaging and a hefty marketing budget. So how can the supermarket possibly sell a pair of these synthetic cream-filled pseudocakes for less than a bunch of roots?

For the answer, you need look no farther than the farm bill. This resolutely unglamorous and head-hurtingly complicated piece of legislation, which comes around roughly every five years and is about to do so again, sets the rules for the American food system — indeed, to a considerable extent, for the world’s food system. Among other things, it determines which crops will be subsidized and which will not, and in the case of the carrot and the Twinkie, the farm bill as currently written offers a lot more support to the cake than to the root. Like most processed foods, the Twinkie is basically a clever arrangement of carbohydrates and fats teased out of corn, soybeans and wheat — three of the five commodity crops that the farm bill supports, to the tune of some $25 billion a year. (Rice and cotton are the others.) For the last several decades — indeed, for about as long as the American waistline has been ballooning — U.S. agricultural policy has been designed in such a way as to promote the overproduction of these five commodities, especially corn and soy.


Friday, June 22, 2007

Nutritional Supplements

Clifbar and Mojobar: http://www.clifbar.com

Magnesium

Tuesday, January 09, 2007

How spicy foods can kill cancers

Something that I've always known intuitively.. Thanks to Sridhar for pointing this.


Scientists have discovered the key to the ability of spicy foods to kill cancer cells.

They found capsaicin, an ingredient of jalapeno peppers, triggers cancer cell death by attacking mitochondria - the cells' energy-generating boiler rooms.

The research raises the possibility that other cancer drugs could be developed to target mitochondria.

The Nottingham University study features in Biochemical and Biophysical Research Communications.

The study showed that the family of molecules to which capsaicin belongs, the vanilloids, bind to proteins in the cancer cell mitochondria to trigger apoptosis, or cell death, without harming surrounding healthy cells.


I think it is also anti-genotoxic.


Saturday, January 06, 2007

Vegetarian diet

Assuming humans can survive on a vegetarian diet, the best argument for doing so isn't what is ethical or what we were designed for. Every time you move up a link in the food chain, only 10% of the energy of the prey is absorbed by the predator (the rest is lost as heat). So, a cow gets 10% of the grass' energy, and by eating the cow we get only 1% of the grass' energy. Eating a bird who eats bugs who eat plants, we're only getting .1% of the plant energy. Vegetarianism would be an easy way to create an abundance of food for the entire population.

I would appreciate it if you mentioned this, because this argument is rarely brought up (and I know no one else will read this comment). Thanks for the entertaining blog.



No study will ever prove or disprove the meat contention. The random, unaccountable differences between individual humans make strict science and human nutrition mutually exclusive fields.

In order for a study to say anything conclusive, the scientists would have to do something like grow 100 genetically identical clones, and then make sure each one got exactly equal amounts and types of water, sleep, stress, excercise, exposure to illness etc etc etc. Feeding half of this group a carefully controlled omnivorous diet and the other half a carefully controlled vegetarian diet with identical levels of macro and micronutrients for 12 months and then measuring their resultant "health" would be somewhere APPROACHING scientific.

Present nutritional studies typically do not have this level of rigour. Now my declatation of bias: I really like meat. Therefore I eat it.



For all the discussion on teeth, I saw a lecture on skull bones once.

From it, I learned that human teeth are:
-Not like dogs - some of their teeth are for gripping, some for chopping up bones to get at the marrow, and some for ripping flesh
-Not like cats, large or small - their teeth are mostly for ripping and slicing flesh
-Not exactly like baboons - males have huge canines for fighting other males
-Not like horses - front teeth for tearing and back teeth for grinding with a gap in between
-Not like rodents - front teeth for gnawing, always growing

-A lot like bears and pigs - people have mistaken their skulls for the skulls archaic skeletons because of the similarities between the teeth

Bears and pigs eat a lot of the same things that humans like to eat, basically everything. In fact, a certain grizzly bear in Yellowstone really liked an entire case of beer he found in a camp and was nicely drunk at the camp when they found him. But then again, when I think of bears eating meat, I think of them clawing at salmon...