First of all they consider it a choking risk and secondly because of other kids allergies. Kids eating on the bus almost always leave a mess...
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Whether you're traveling by airplane or by bus, there are some strict safety standards each bus provider has to comply with in the US that you should know before you book a bus in the USA. The good news: Food and non-alcoholic beverages are allowed on the bus! Alcohol is forbidden on US buses.
TFL has a document published named the “TFL Conditions of Carriage”, which explains the house rules — no drinking booze, no smoking, no flash photography, no hoverboards (yes that's on there) — but there is no mention of food at all. Food is legally allowed to be consumed on TFL services.
Riding on the BusStay in your seat and face forward: never stand on a moving bus. Keep noise level down and do not distract the driver (no yelling or shouting). Do not throw anything on the bus or out the window. Keep hands and feet to yourselves.
The factors contributing to fatigue differ between bus drivers, just like any other profession. However, drivers who maintain a rigid schedule of work and sleep usually have less trouble dealing with fatigue. Fatigue is your body's signal to you that it needs rest and quality sleep.
Stick with foods that have very little aroma or with aromas that aren't likely to offend. Anything excessively crunchy. An apple is usually ok, but we think eating a big bag of chips can get disruptive to other passengers.