Obesity has been associated with increased reward sensitivity to food stimuli, but the relationship between food olfactory stimuli and obesity is still poorly understood. This study investigated whether individuals with overweight and obesity exhibit increased liking of food odors and wanting of the relative foods, compared to normal-weight individuals, and whether alexithymia, associated with poor interoception, contributes to altered responsiveness to food. Liking and wanting for food and non-food odors presented with an olfactometer were measured through explicit (self-report ratings) and implicit measures (heart rate and skin conductance) in 23 normal-weight and 20 women with overweight/obesity. Differently from normal-weight women, those with obesity explicitly rated food odors as less pleasant than non-food odors, while at the implicit level, both food and non-food odors were associated with reduced heart rate response, indicating increased perceived pleasantness. Importantly, implicit liking for food odors was higher in women with obesity than normal-weight women. No differences between normal-weight and women with obesity emerged in wanting measures, however, while normal-weight women show higher skin conductance response for food odors than non-food odors, women with obesity did not exhibit differences between the two categories of stimuli. Alexithymia was associated with increased implicit liking and explicit wanting of food odors, in particular in normal-weight women. These findings suggest a dissociation between liking and wanting components of reward sensitivity in response to food odors in individuals with obesity. Moreover, both affective and motivational responses to food reward seem to be affected by alexithymia, an aspect that should be taken into account by future studies evaluating the effect of cue exposure intervention for obesity treatment.