次の英文を和訳してほしいです。
There was one large difference between the animal study and the human research projects mentioned in the article: the researchers controlled what the animals in the earlier studies ate, while the humans reported their eating behavior. Thus, as Dr. Bartke mentions, there is a question about the quality of the data. As long as the researchers kept careful records on what was fed to the animal subjects and prevented the animals from getting food from other sources, they could be confident of the food intake measurement. Humans, however, are not lab rats. It is not ethical, or generally possible, to completely control the environment that a human experiences. In this case, it was likely not economically feasible to control the diet for the subjects in the “diet group.” As a result, the researchers relied on self-reported data from these subjects. It is very unlikely that all of the members who reported that they cut their caloric intake by 30% actually did so. If the control their diet and observe their action, then we might be able to accept that the members of the group actually reduced their calories by 30%. However, one would then worry that a group of people who could take three months to go to a lab environment might not be representative of the general population.
