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Rankin points out that even small changes in a person's energy balance can have a significant effect on weight. Studies have shown that eating just 10 to 20 extra calories per day - that's one peanut M&M or one tortilla chip - that don't get burned through activity can result in a 2-lb. gain on average over the course of a year. "But none of the methods we have now are accurate enough to pick that up," says Rankin...
Still, the study highlighted some encouraging trends. For instance, the percentage of teens who spent more than three hours a day in front of the TV dropped from 1999 to 2007, from 43% to 35%. While Wang acknowledges that students may simply be substituting computer or other sedentary screen time for television-viewing, he notes that it's still a trend in the right direction. Far from being an excuse not to exercise, Wang sees the data as a wake-up call for parents and teens. "The important message is that compared to the recommendations for physical activity, the physical...
Nearly every day at dawn, John Heitz falls a little bit in love. Leaning over a 150-lb. (70 kg) yellowfin tuna, the 55-year-old American, whose business is exporting fish, circles his forefinger around its deep eye socket. "Look how clear these eyes are." He traces the puncture where the fish was hooked, and the markings under its pectoral fin where it struggled on the line. "Sometimes," Heitz says, "I see a good tuna, and it looks better to me than a woman...
...pink meat that they rub between their thumb and forefinger and smell. The biggest and best tuna will go for about $700 wholesale, and get whisked away to be washed, beheaded, gutted and packed with dry ice to catch the 10:30 a.m. flight to Manila. By the next day, the fish will be in Tokyo, Seattle or California. By the next night, its meat will be poised between chopsticks. (Watch TIME's video "The Trouble with Tuna...
...Philippines" when fishermen could go out in the morning and return at dusk with two or three 150-lb. (70 kg) yellowfin or bigeye, two tuna species that, like the bluefin, are sold for sashimi. Now, even the smallest of those tuna are at least a two- or three-day trip out to sea. These waters, like so many others, have been fished too hard for too long. "General Santos lives and dies by tuna," says Heitz. "Now it's getting less and less. People just have to wake up and smell the coffee...