that can deplete the ojas, or life sap. It's a matter of balance. If you are sick and trying to heal, you need all the ojas you can muster.
Rajas is the subtle form of pitta (fire). It can aggravate the mind. Think of cultures that are known (stereotypes) for eating a lot of garlic and you'll also find they are known for emotional volatility as well. That is the rajas at work.