Sometimes the serving-size data on label is much smaller than most people eat at one time true or false?

True.

The serving-size data on a label is often much smaller than most people eat at one time. This is because food companies are required to list the serving size based on the amount of food that is typically consumed at one time. However, many people eat more than one serving of food at a time. For example, the serving size for a bag of chips might be 1 ounce, but many people will eat the entire bag in one sitting. This can lead to overeating and weight gain.