The graph shows changes in body weight of rats that were permitted one-hour or twenty-four-hour access to food each day. Rats with access to a running wheel spent time running and lost weight, especially those with only one hour of access to food. (Data from Nergårdh, R., Ammar, A., Brodin, U., et al. Psychoneuroendocrinology, 2007, 32, 493–502.)
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