Calling it a demand side problem implies you don't want more people living in desirable areas (I'm guessing you live in one of these areas?). That is blatant NIMBYism mixed with some xenophobia. When you reduce demand people are priced out by high interest rates and have to move to less desirable locations. That has real impacts. People have to commute further to their jobs. People can't get their ideal jobs, not because they're not qualified, but because they can't afford housing. That is not an ideal outcome compared to just building more supply.
Contrasting calorie consumption with the housing market is just disingenuous. One is clearly not a market and the other one clearly is. People like you are just going to have to understand that as population in North America grows cities are going to have to get denser and your lifestyle is no longer a viable one because it comes at the cost of millions of peoples' lives.