Body Odor (Odour) otherwise known as bromhidrosis, osmidrosis and ozochrotia is a perceived unpleasant smell our bodies can give off when bacteria that live on the skin break down sweat into acids. Sweat itself is almost completely odorless to humans. Body odor can smell pleasant and specific to the individual and can be used to identify people, though this is more often done by dogs and other animals than by humans.
According to Medilexicon's medical dictionary:

Bromhidrosis (or bromidrosis) is a "fetid or foul-smelling perspiration. Apocrine bromhidrosis affects the axillae after puberty, and eccrine bromhidrosis is generalized, with excessive sweating."
An individual's body odor is also influenced by:

• Diet: Dietary habits and choices play a significant role in health and mortality, and the same applies to body odour. Spicy foods like curry, garlic and some other spicy (piquant) foods have the potential to make some people's sweat more pungent. Some experts believe a diet high in red meat may also raise the risk of developing more rapid body odor.
• Gender: In normal instances people of the male gender has the tendency to sweat more than their female counterpart.

• Genetics: Body odor is largely influenced by major histocompatibility complex (MHC) molecules. These are genetically determined and play an important role in immunity of the organism. One study suggests that body odor is genetically determined by a gene that also codes the type of earwax one has. East Asians (those of Chinese, Japanese, Korean, and Vietnamese descent) have the type of sweat glands that even after hitting puberty still don't produce the chemicals found in the perspiration of other ancestral groups. East Asians evidently have a greater chance of having the ‘dry' earwax type and reduced axial sweating and odor. This may be due to adaptation to colder climates.
  The following could be considered as Home Remedy For Body Odour:
• To prevent body odor, drink a glass of water in the morning, on an empty stomach, along with 500 mg wheat grass. The chlorophyll present in the grass will help in reducing body odor.
• You can also apply baking soda to your armpits as well as to your feet, to reduce body odor.
• While bathing, add alcohol or white vinegar to a mug of water and use it to rinse the armpits. This will definitely help in lessening the body odor.
• One of the simple home remedies for body odor is to put a few drops of rose water in the bathtub, before taking bath. It will give you a long lasting freshness and serve as a good substitute for deodorant.
• To reduce the pH of the skin and eliminate armpit odor, one can use apple cider vinegar instead of deodorant. Put it in a mug of water and use it to rinse the armpits, while bathing.
• Take showers, at least thrice in a day, in the summer season, when one tends to sweat a lot.
• Prepare a homemade deodorant with the juice of about two dozen radishes and 1/4 teaspoon glycerin. Mix the liquids well and pour into a spray-top bottle. Spray this in the armpits to fight body odor. Remember to store it in fridge.
• During summers, you can apply the baby powder or talc to your armpits, in place of deodorants.
• Pour some white vinegar on a cotton ball and wipe your underarms with the cotton. While the vinegar smell would fade in some time, you would remain smell-free for the rest of the day.
• Mix two drops of the tea tree oil (essential oil) and one ounce of water. Pour this in a spray-top bottle and use as a deodorant. Since tea tree is an antibacterial herb, it would act favorably in preventing body odor.
• Mix 10 drops of the essential oil in 30 ml water. Apply this mixture on the armpits to reduce body odor.