Pregnancy brings out a variety of hormonal and physiological changes. Estrogen and progesterone levels increase suddenly and dramatically in pregnant women. A number of other hormones' amounts and functions are also altered in them. Not only do these changes affect our mood, but our five senses may also seem to go into overdrive during pregnancy. Foods we enjoy may begin to taste strange, certain aromas may get stronger, and we may become sensitive to touch and get the point. Hormonal changes, most notably the hormone oestrogen, are to blame for this shift.