Which measure can best individuals lessen their chances of acquiring a disease?

Various preventive measure can help.

Explanation:

To reduce the chances of any disease a person should follow a healthy lifestyle which  can include:

A proper diet: A proper balanced diet on time is a major part of a healthy lifestyle. Increase the percentage of liquid intake in your daily routine.Proper sanitation: Proper sanitation is very important to keep many diseases away from your body. Unhygienic environment and habits can make you sick and can cause many related diseases.Exercise: A proper physical exercise in the morning gives you a fresh energy to work throughout the day and keeps the body balanced.A Healthy Daily Routine: A bad routine can cause bad functioning of the body like increasing cholesterol, stones, kidney problems etc.Avoid Junk and processed food: Junk food should be avoided in the diet as it contains very less nutrition and is harmful for the body in the long term.Proper meditation: The mental health is also important with physical health to maintain the internal peace of the mind to be happy throughout the day.