Food and Drink

Q: Is Hookah really haraam in Islam?

Q: If a restaurant is owned by a non-Muslim but he has advertised his food as Halaal, is it permissible for a Muslim to eat non-veg food at this place?

Q: What is the meaning of istihalah when something najis becomes pure? Like gelatin from pork?

Q: Is fat from pigs najas if it is already chemically converted to glycerin or stearic acid?

Q: Does Istihalah make najas things pure? Especially, when fat from pig is altered chemically and used in beauty creams?

Q: It is sunnah to eat one meal a day. But the method of meal is (any of the regular occasions in a day when a reasonably large amount of food is eaten) and so in my breakfast I only eat a bowl of cereal or 2 toast with milk so is it considered a meal because it is less than lunch or dinner and it's not a reasonably large amount?

Q: My question is that "Is hedgehogs halaal or not?" Please tell me with detail reference Jazaak Allah.

Q:

1. Is there a hadith which says a person who eats or drinks haram, his dua and salah is not accepted for 40 days?
2. After eating haram, if the person repents straight away will his dua and salah be accepted or it will still not be accepted until after 40 days?

Q: If a compound is taken from pig and then changed into new a different material through chemical reaction, is that halaal to eat?

Q: I bought your book Sunnats where in chapter sunnat of eating it is written it is not makhruh in eating without a cap. I doubt whether it is a printing mistake.