What does it mean if your body odor changes? 
You may notice a change in body odor if you start a new medication, such as an antidepressant. Some studies show that a woman's body odor changes depending on the specific time of her ovulation cycle.
You may also notice other odors if you change your diet. Foods that contain sulfur (like broccoli and cauliflower), spices, or drinking coffee and alcohol can all affect your smell.
Diseases that cause body odor? 
Changes in body odor can also mean that you may be sick or have an underlying illness. Conditions such as diabetes, kidney disease, or liver disease can make body odor worse.
If you have diabetes and your blood sugar is too high, your breath may start to smell fruity. If this happens suddenly and you also urinate a lot, it's important to see your doctor right away.
Another condition that causes a change in body odor is trimethylaminuria. Trimethylaminuria is a metabolic disorder in which the body is unable to break down trimethylamine. Trimethylamine is found in eggs, fish, liver, and legumes. When trimethylamine builds up, it is released through sweat, breath, urine, and reproductive fluids, resulting in a fishy odor.
It doesn't seem to contribute to any other health problems, and symptoms can be alleviated with some specific dietary changes and soaps.
Has your body odor changed during pregnancy?
Many pregnant women find their sense of smell to be more sensitive, but a woman's own body odor can also change during pregnancy. Hormonal changes associated with pregnancy are to blame.
Hormonal changes can increase sweating and your heightened sensitivity will smell more than usual anyway, so don't worry too much about it.
Your body will sweat more trying to keep you cool while all the extra blood will pump through your body to carry nutrients to your growing baby. Heavy sweating can mean smelly feet, smelly armpits, smelly groin – in fact all places where bacteria and sweat normally combine. Some pregnant women may also experience night sweats.
Almost all women have more vaginal discharge during pregnancy. Normal discharge is light and creamy in color, has no unpleasant odor, and does not cause itching. See your doctor right away if your discharge is unusual or bloody.
Body odor after pregnancy
You're likely to sweat more than usual for a few weeks after giving birth, especially at night, as your body drops the levels of estrogen and progesterone needed during pregnancy. Make sure you stay hydrated by drinking plenty of water.
Body odor while breastfeeding
Smell is an important part of the bonding process between mother and newborn. Glands around the nipple secrete an odorous fluid after a woman gives birth, and scientists believe that newborns have a response to this smell. It has even been shown that the smell of breast milk can soothe premature babies and help relieve pain.
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