Answer: The Center for disease control and prevention (CDC) uses the Body Mass Index(BMI) to determine categories of overweight and at risk for being overweight
Explanation: BMI is defined as the body mass of an individual divided by the square of their height.
The BMI is used to categorize a person as underweight, normal weight, overweight, or obese based on the ratio of their body mass to the square of their height.
Underweight are categorised to have a BMI of under 18.5, normal weight has a range of 18.5 to 25, overweight has a range of 25 to 30, and obese over 30. The unit for the BMI is the kg/m²
This is called complete communism. Currently, no country has practiced this, as it could lead to a revolution.
"Remarketing" is the technique you're looking for. This technique targets your computer, not you, and gives you advertisements based on what you were looking at online.