I am East Asian and came to America in my 20's. I love pastries and deserts, always looking for local pastries to try whenever I travel, to the point to book hotels that are close to famous pastry shops.

Sorry for any misunderstanding my early comment causes.

Good? I'm not sure it's a humble-brag unless you parade around about it, but if people associate a healthier lifestyle with status, then it's bound to propagate.

I think you got it the wrong way around.

Imitation of habits with percieved high prestige value is one of the most strongest causes of cultural shifts.

Cultural shifts are accompanied by lot of things - including bragging about ones new lifestyle - which then drives the shift in braggees network (social proof if he/she is an average member of the network, imitation of an idol figure if her status is high).

Even if that's true, what's your point?