I'm not op - i eat cheap (outside of my going out for lunch at work meals for 10€) but unhealthy. I did a quick estimate based on my cc charges in the last month and I don't think I'm above 250€ a month, while eating out for lunch around 13-15 times a month... I definitely agree that 5€ per meal is a lot.

Tbh I'm not nutritionally educated enough to know how relevant this actually is, but I was under the impression that some variety of ideally fresh produce would be required for optimally healthy food, and that is what seems to be expensive to me. Otherwise yea, aldi spaghetti for 80 cents and whipping up a sauce without much fat for maybe 5 euros max (high estimate) wouldn't be particularly unhealthy either and last a day, and much like your rice with beans example there are probably many meals like this.