Arriving just after breakfast, our first stop was at the Hunger Analyzer station, where DoCoMo reps were on hand with a Bluetooth accessory that measures acetone levels, sending results to an app that determines not only if it's time for you to eat, but also whether or not your body is in a good position to burn fat with exercise.

ENGADGET: NTT DoCoMo bad breath, body fat and food analyzers hands-on (video)

It is also a time for the community to light candles, dress in their best clothes, invite friends for parties and eat traditional foods, including Indian sweets such as barfi, a milk-based candy, and ghoogra, a pastry made of cereal and sugar.

BBC: Thousands celebrate Diwali