Final answer:
Fit individuals often use a greater proportion of fat as a fuel during low-intensity, long-duration exercises. The ratio of slow-twitch to fast-twitch muscle fibers varies among individuals and is not the same for everyone. The true statement regarding obesity is that fat has more calories per gram than protein or carbohydrates.
"the correct option is approximately option B"
Step-by-step explanation:
Fit individuals use different fuel sources during exercise based on the intensity and duration of the activity. It is often said that during lower-intensity, longer-duration exercises, fit individuals tend to use a greater proportion of fat as fuel compared to less fit individuals. This is because as the intensity of exercise increases, the body gradually shifts from using fats to carbohydrates for faster energy. This concept relates to muscle fiber types as well—slow-twitch muscle fibers are more efficient at using fat for energy, and fit individuals often have a higher proportion of these fibers.
Regarding the proportion of slow-twitch to fast-twitch muscle fibers, it is False that all people have the same ratio. This proportion is genetically determined and can vary greatly among individuals, affecting their suitability for different types of physical activities.
Concerning obesity, statement c (Fat has more calories than protein or carbohydrates) is the accurate one. This fact is important for understanding dietary impacts on health, as consuming higher-fat foods can lead to quicker energy surplus and therefore weight gain if not balanced with physical activity. In terms of food consumption patterns, approximately 25 percent of people consume less than 29.26 percent of their calories as fat, while the probability that a person consumes more than 40 percent of their calories as fat is 0.3446. A balanced diet is not just about energy storage but also about providing the right materials and signals for metabolic reactions in the body.
Furthermore, it's true that in environments such as winter when food availability may decrease, having a reserve of energy stored as fat can be crucial for survival. Lastly, the concept of trans fat being a type of unsaturated fat is misleading; though chemically it is an unsaturated fat, trans fat behaves like saturated fat in the body and is associated with negative health effects. Bulimia nervosa does not always involve vomiting; it can involve other methods of purging as well.