Carbon monoxide in the kitchen mainly comes from fuel and lampblack produced by incomplete cooking, which is one of the main pollutants in the kitchen air. If cooking is not well ventilated, those lampblack can be easily inhaled, causing "lampblack disease". The main manifestations are: loss of appetite, hunger, but tasteless food, poor spirit, lethargy, general weakness, usually eating less, but gradually gaining weight. This is also one of the reasons why many chefs are fat and have a thick waist.

The kitchen is relatively closed, and there is no place to emit heat after high temperature baking. Especially in midsummer, if the chef works in a "steamer", heating will lead to an increase in heart rate and blood pressure, and excessive sweating will lead to a decrease in renal blood flow and further damage to renal function.