IT has been postulated that “some correlate of body weight” might control daily food intake1,2. This could work through sensory feedback, as in the case of behavioural temperature regulation. In thermal sensation a stimulus (limited to between 15° and 45° C) feels pleasant when it is conducive to homoeo-thermia and unpleasant when it threatens homoeothermia. This transformation of pleasantness is dependent not only on internal signals but also on the thermoregulatory set point3. The change of sensation from pleasant to unpleasant depending on the internal state also applies to taste and smell4,5. We have explored this phenomenon further, to determine whether these changes in olfactory and gustatory sensations also were dependent on a set-point related to body weight. If modification of body weight also affects gustatory and olfactory sensation, this will provide strong evidence for (a) the existence of a regulatory process for body weight, and (b) the use of sensory feedback in feeding behaviour.