The main reason I found this interesting is that recently my wife and I started eating Shyojinryori (the food the Japanese monks eat) quite consistently. The food is vegan and also contains no onions, spiciness, or garlic. It was a first for me to leave these out. I noticed within a few days that I could smell multiple times better. My wife had a work party where she broke her diet. When I came home, the entire house reeked of garlic and alcohol to the point where it was uncomfortable to breath. I had to open the windows in our room despite the freezing temperatures.
I ended up also breaking the diet because I just couldn't stand the smell of people in the subway. Popped a bit of garlic and onions in my food, and I could no longer smell the people around me.