Studies are not showing animals do not feel pain, but to the contrary, any being used do. Rather than deal with the cognitive dissonance it is better for even just mental health to decide to avoid the contribution to suffering with just choosing nothing taken from animals for what to have or to eat. And the extinction rate of species is related to food choices, that alone gives very great reason to not use products from animals anymore. Of course there is the healthiest way without products from animals when avoiding processed stuff that gets added in things, I have tasty meals with this way.
https://www.biologicaldiversity.org/programs/population_and_sustainability/food/ Really it is about finding other things as alternatives to eat which you really love having, especially any that are healthy. Treat yourself to those often. You can then pretty much forget those things that you saw good reason to give up. I have gone through a number of changes that included this way, it’s been working really well.