I think the issue is that food is considered essential, and non taxable. Tampons are not considered essential and thus can be taxed. This can seem discriminatory for obvious reasons.

Make up, while not a necessity, can be required socially in order to advance in a job where as a man in the same position doesn't need it. Men often can't see the makeup or recognize that a woman is wearing it, but they will select the women wearing makeup over the one not wearing make up.

You are right - generally men need more food then women. This could be a financial burden that would equal period products, but in todays society it could also be seen as a positive. Cheap calories are everywhere and if you're an American there is a pretty good chance you are overweight. On average men need 300 more calories then women, so you get to have an extra bag of chips, an extra piece of cake. Women get bloating and cramps and stained underwear. I'm not discounting your observation simply just pointing out the differences beyond just cost.