It's difficult to test whether the organics will help a family or not unless you try to give a family organics, see how long they live then use a backup from when the adult got married and try feeding them plain groceries to see the difference. Keep in mind that some things may interfere with this such as illness, although if there are more illnesses without the use of organics, that could be another theory.
I'm not sure how the natural death age is determined for our peeps I'm just guessing that each person will be assigned that number once they appear in the game.
If I'm not mistaken, the organics do provide 100 more units of food than the regular groceries but the cost of the groceries is still higher than buying two regular bags of groceries which makes up for the units.
It's all up to you I guess! I like to believe that I'm lengthening the lifespan of my peeps and since I'm well into my 6th generation, I can afford the organics.
