Duffy MacKay, vice president for scientific and regulatory affairs at the Council for Responsible Nutrition, a trade group for the supplement and energy-drink industries, called the study "a new, emerging hypothesis, " but said the researchers were drawing large conclusions from small studies of mice, bacteria and human biomarkers.

WSJ: New Health Culprit Carnitine Found in Red Meat

Duffy MacKay, vice president for scientific and regulatory affairs at the Council for Responsible Nutrition, a trade group for the supplement and energy drink industry, called the Nature study "a new, emerging hypothesis, " but said the researchers were drawing large conclusions from small studies of mice, bacteria and human biomarkers.

WSJ: New Health Culprit Carnitine Found in Red Meat

Bud Darr, the group's senior vice president for technical and regulatory affairs, said the industry is "very heavily regulated, " from the way ships are designed to how crews train for emergencies.

NPR: No Central Agency Oversees, Inspects Cruise Ships