Final answer:
Approximately 30% of the world's population is overweight, with obesity rates significantly rising since 1975, leading to increased health risks and associated diseases.
Step-by-step explanation:
In round figures, approximately 30% of the world's population is overweight. This means that nearly one-third of people globally carry excess weight, posing significant health risks. Obesity, which involves having too much body fat, has increased substantially and now impacts various regions differently, contributing markedly to noncommunicable diseases such as diabetes, heart disease, and certain cancers.
Worldwide obesity has been on the rise and has tripled since 1975. In the United States, for instance, nearly 36 percent of adults over 20 years old are obese, and an additional 33 percent are overweight, according to reports by the U.S. Centers for Disease Control and Prevention. This leaves only about 30 percent of the population at a healthy weight, illustrating just how widespread the issue of being overweight is.