According to Ryanair, you are welcome to do so.
As for diseases etc., the regulations usually regard meat and dairy products, but if you are traveling within EU, you are ok. Outside, however, it depends on the country.
In my experience, ham and cheese sandwiches have never been a problem on European flights, including those with Ryanair. As long as it is not liquid (see Edit) you shouldn’t have any issues getting it through security and on board.
Edit:
Gathering the comments on non-obviously liquid items that will/may cause problems at security gates:
Apparently fruits are OK (but not too juicy/mushy? ;))
The website of RyanAir states that food is okay to bring.
I would suggest using a plastic bag or plastic container, instead of a metal container shaped as a bomb, but I guess that’s pretty obvious. And there won’t be any safety risks if you bring regular food like bread/sandwiches/etc.
You can’t bring drinks through the security check, however you can buy drinks afterwards to take on your flight.
Credit:stackoverflow.com‘
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