Word: weightness
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...does this mean that exercise isn't important in controlling weight? As tempting as that conclusion might be, Wang and other health experts say that's not exactly what the new data show. The findings may say less about the role of exercise by itself than about the other variable in the weight equation - diet - and the interaction of the two. While exercise may not contribute directly to weight loss, it is critical for maintaining a healthy weight, since it helps calibrate the balance between energy taken in and energy burned off. "The data is too gross, and too general...
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...
...fresh 271-lb. (123 kg) bluefin snared off Oma, a small Japanese town. Bluefin can live for decades, growing more than 10 ft. (3 m) long, weighing up to 1,500 lb. (680 kg), and with enough muscle to propel them at 40 m.p.h. (65 km/h). Throwing his weight into the fish as he makes a cut, Morishima is philosophical. "Some think it's endangered, and I understand their position, but what can you do by worrying about it?" he asks. He'd like all his bluefin to come from Japan, but if there are none on any given...
...Ricardo Fuentes have injected Atlantic bluefin females with synthetic hormones to trigger the fish's egg-laying response. This year, the team helped create some 150 million bluefin eggs, of which they took about 3 million to try to hatch. Of those, "maybe 50 [will] survive to the weight of one gram, or about 50 days [old]," says Aurelio Ortega, a biologist on the project. "We're still a long way off. Even five years would be very optimistic...
...Aquaculture is not a perfect solution. Farmed tuna have huge appetites - in Cartagena, it takes up to 22 lb. (10 kg) of seafood to add 2 lb. (1 kg) of weight - and they create a lot of waste. But tuna-breeding is one of an expanding list of ideas being rolled out by scientists, activists, chefs, fishermen and entrepreneurs trying to find a happier marriage between the human demand for tuna and the ecosystem. "There is no one silver bullet to end overfishing because there is no one thing causing overfishing," says Mike Crispino of the ISSF. Major canneries that...