In a recent study, a group of subjects had their normal daily caloric intake increased by 25 percent. This increase was entirely in the form of alcohol. Another group of similar subjects had alcohol replace nonalcoholic sources of 25 percent of their normal daily caloric intake. All subjects gained body fat over the course of the study, and the amount of body fat gained was the same for both groups. Which one of the following is most strongly supported by the information above? ['The proportion of calories from alcohol in a diet is more significant for body fat gain than are the total calories from alcohol.', 'Body fat gain is not dependent solely on the number of calories one consumes.', 'In the general population, alcohol is the primary cause of gains in body fat.', 'An increased amount of body fat does not necessarily imply a weight gain.']