What can be eaten and what not?

What can be eaten and what not?

Some food items as a species are not good. Some are to be avoided as they do something bad to us. Some are time barred! Some are to be avoided due to their association. Some due to their inherent quality. Like this there are various ways why some food items are to be not partaken.

Onion, red 'drumsticks', garlic, (in short allium cepa family ) mushrooms, stem of lotus flower, suraikaay belong to the species of the plant kingdom that is to be avoided.
if someone with nasty thoughts look at food it becomes bad. Food cooked in oil and stored for a long time becomes bad.
'pazhaiya sORu' which is popular in tamil nadu is also objectionable.
Curd, honey don't become stale and fried eatables stay for a long time.
Food items cooked with alcohol and onion; milk from cow which delivered just within 10 days are bad due to association.
If a doubt arises whether a particular foodstuff can be eaten or not it is not to be eaten. This concept is called 'sahrulleham'.
Sage parasara proscribes white brinjal, resins from tress (the famous asofoetida is one such), milk of camel, goat; and 'temple properties' .
Food items from yava and wheat are not time barred ever. Except curd no food items gone sour can be consumed. (for emergencies such item can be washed and eaten)
At night time sour ginger, curd, cooked rice with gingely, gooseberry (amla) are to be avoided.
Some items are not to be brought together. Bronze vessel + coconut water / cane juice; copper vessel + curd/ milk; salt + milk, ghee.
Such combinations denature the food.
Ok, ok you say we don't want don'ts tell us do-s.
If a person has one of these in his stomach Lord Hari is near him: Tulsi, agaththi, gooseberry, soil (sundaikkaay).
He who eats anything uttering the words 'Narayana' reaches good worlds ultimately.

(I know that there will be a lot of objections to including onions and garlic in this list but what to do? It is said so in sastras! Personal tastes are health concerns (by western concepts) might clash with these ideas. Make your choice!)