Final answer:
Populations with greater energy needs include growing children, pregnant or lactating women, and physically active individuals, whereas older adults and sedentary individuals typically have lower energy needs.
Step-by-step explanation:
Different populations demonstrate greater or lesser energy needs based on various factors such as age, size, metabolism, and level of physical activity. Generally, groups that have higher energy needs include children and teenagers who are growing, pregnant or lactating women, and individuals with physically demanding jobs or who engage in intense physical activity. Conversely, less energy needs are often seen in older adults, people with sedentary lifestyles, or those with less muscle mass. It's important to note that these needs can be highly individualized and can vary even within the aforementioned groups.