The nutrients that provide energy are carbohydrates, proteins and vitamins. The other three nutrients--vitamins, minerals, and water do not provide energy.
The law of conservation of mass states that in any closed system the mass of the system is neither created nor destroyed over time i.e, the mass cannot be changed overtime.
Oxfam International's is a UK based charity 'Commitment to Reducing Inequality (CRI) Index' ranks India in bottom 12 of its research. India ranks 147 among 157 countries in Inequality Index.