By "no free lunch" I meant that any change which evolution could easily have led to, but didn't, has likely not been evolutionarily advantageous for long enough

By "no free lunch" I meant that any change which evolution could easily have led to, but didn't, has likely not been evolutionarily advantageous for long enough or with great enough selective pressure to happen. Emphasis on "easily", "likely", and "long enough"/"great enough". I don't think evolution could easily have solved most dietary deficits, manufactured clean water, prevented every endocrine condition, or designed vaccines for us. I'm not even sure what that last one would mean! These things are a nearly-free lunch because we live in industrial economies that can ship oranges around the world and build dams, but they're not an evolutionary free lunch. (And the loss of vitamin C production is argued to be an adaptation to starvation, too, just like we're arguing that lower GLP-1 is an adaptation to starvation: https://academic.oup.com/emph/article/2019/1/221/5556105 https://academic.oup.com/emph/article/2019/1/221/5556105)