It's difficult to tell if our moods are affected by pressure or by pleasant weather. If they do, the effect must be extremely slight. Several research have examined the relationship between the weather and our moods, and air pressure appears to have the least impact. Studies have shown that people tend to feel better when it is not too hot or cold, when there is some humidity in the air, and when the wind is not blowing hard. However other studies have found no correlation between pressure changes and feelings of well-being. Air pressure affects how heavy objects appear to be. When it is low, an object will appear lighter than normal; when it is high, an object will appear heavier than normal. Researchers have also suggested that atmospheric pressure may play a role in the emotional effects of certain medications. Taking antidepressants for example, during periods of low pressure you would need to dose them at a lower level than during high pressure days. Similarly, when pressure is low, alcohol seems to have less of an effect on us; at high pressures, however, we need less of it to feel drunk. Not much is known about how air pressure affects those with bipolar disorder or any other mental illness, but since it has such a small effect on those who aren't disabled by their conditions, it may not matter too much to them either way.