Final answer:
The most common and easiest method for assessing daily intake is by keeping a food diary, which involves detailed recording of all food and drink consumed.
Step-by-step explanation:
The most common and probably easiest method of assessing daily intake is through the use of a food diary. This method involves recording all the food and drink one consumes over a certain period of time. The food diary should include the name of the food, the amount eaten, and the nutrient information, if available. This approach allows individuals to monitor their dietary habits and make changes if necessary. It is particularly useful because it provides a detailed picture of intake and can be done with little to no specialist knowledge or equipment.
In the context of a study, if researchers need to assess the impact of diet and exercise on the prevalence of a disease such as diabetes, utilizing a food diary within a thorough methodological framework can provide valuable insights into patterns that may affect health outcomes.