The answer is electrons.
A covalent bond is a type of chemical bond where atoms share electrons. Covalent bonds are also referred to as molecular bonds because they form molecules when bonded.
This type of bond occurs between non-metals. An example of a compound or a molecule that is formed through covalent bonding is water. It is a combination of two hydrogen atoms bonded with an oxygen atom. H₂O
An average woman needs 2000 calories and a man needs 2500 calories. So the answer is whichever one you are deciding for.
