<human>: I remember when I was little never hearing about anyone having a gluten allergy, peanut allergy, autism etc (even though Im sure they existed.. Im not denying that they didnt exist).  But I feel like now, everywhere you turn, these are constant things being talked about and everyone has been diagnosed with something.. 

For example, My friend made cupcakes for a little kids birthday party this past weekend but couldn't stay at the party because she had to go to work.  A few hours later she receives a call from a father at the party (a complete stranger)  to make sure there wasn't any "traces of peanuts" in the cupcakes because his daughter is highly allergic.  My friend had to list everything she put in them just to ease his mind.  Even when I go get coffee in the morning there is a sign that says "Most of our products contain traces of peanuts" at the store or signs that say "we offer gluten free products." I don't remember any of this from when I was little and I guess they are just covering their asses because people can sue you over anything nowadays?

So Redditors, Do you think that these conditions has always existed and people just went undiagnosed for a long time (maybe because there wasn't an actual name for it)? Or maybe our diets and lifestyle changes brought upon these allergies/conditions?

Can you give me the gist of the text in a nutshell?
<bot>: People have gluten/ nut allergies, autism etc.. Have they always existed or has our diet/lifestyle changes contributed to developing these allergies/conditions?