Can eating red onions lower your risk for heart attack and stroke? A new study suggests the answer to that question may be yes. At least if you're a hamster. Scientists in Hong Kong fed crushed onions to hamsters that had been on a high-cholesterol diet. After eight weeks, the little guys' levels of low-densitiy lipoprotein (LDL) cholesterol fell by 20 percent, the Daily Mail reported. That's good news, because elevated LDL cholesterol levels are linked to cardiovascular disease. At the same time, there was no decline in the hamsters' levels of high-density lipoprotein (HDL) cholesterol - the good...