Charles Darwin and his contemporaries postulated that food consumption in birds and mammals was limited by resource levels, that is, animals would eat as much as they could while food was plentiful and produce as many offspring as this would allow them to. However, recent research has shown that, even when food is abundant, energy intake reaches a limit, even in animals with high nutrient demands, such as lactating females.

AP - As swine flu runs rampant in the Southern Hemisphere winter, world health experts are concerned that some hard-hit countries have been reluctant to take forceful measures to protect public health.

ST. LOUIS, July 3 (UPI) -- Four out of 106 heart replacement valves from pig hearts failed, U.S. researchers found.

ATLANTA, July 3 (UPI) -- Seventeen percent of U.S. adults say they have urinated in a pool, but 78 percent think their fellow swimmers have urinated in pool, a survey indicates.

HealthDay - (HealthDay News) -- Before some people develop full-blown
diabetes, their blood sugar is above normal, but not high enough to
qualify for a diagnosis of diabetes.

HealthDay - FRIDAY, July 3 (HealthDay News) -- Extreme drug-resistant tuberculosis
might someday meet its match in two drugs now used to treat Parkinson's
disease, suggests a new study.

SAN FRANCISCO, July 3 (UPI) -- U.S. researchers, in a study in mice, found bone marrow stem cells improve cardiac function.

OKLAHOMA CITY, July 3 (UPI) -- U.S. researchers say a new, natural compound may stop diabetic retinopathy -- a leading cause of blindness.

HealthDay - (HealthDay News) -- Before some people develop full-blown
diabetes, their blood sugar is above normal, but not high enough to
qualify for a diagnosis of diabetes.