In English, a person is said to be as "good as gold".
Along these same lines, in Italian you say; "buono come il pane", or as good as bread.

Lui è buono come il pane e non fa male a nessuno. He's a good person and wouldn't(doesn't)hurt anybody.

In Spanish we say for example; "El es más bueno que el pan." Lui e piu buono che il pane. He's a nice good person.

I find it really interesting that there are these expressions! But why are you as good as bread?!

Throughout history worldwide, humanity has relied on bread for sustenance. Egyptians believed that the
sun and rain were gifts from the gods, so they expressed thanks for earth's fertility by offering bread sacrifices.

In the Christian eucharist ceremony, bread represents the body of Christ and symbolises the nourishment of the soul.
During Passover, Jews eat only flat breads, symbolising their ancestors' freedom from slavery.

The Lord's Prayer, for example, contains the line 'Give us today our daily bread'; here, 'bread' is commonly understood
to mean necessities in general. In Israel the most usual phrase in work related demonstrations is "lekhem, avoda" [bread,
work], and during the 1950s, the beatnik community used the term bread as a euphemism for money.

Bread is more than just a food. Just think of how the word is used: A person’s “bread and butter” is his or her main source
of sustenance, while bread or dough can be cash, plain and simple. When people “break bread” they share more than just a meal:
They come together in body as well as spirit.

In many, many cultures around the world, bread is offered to a guest as a way of welcome and hospitality, even if it is the family's last bit of something to eat.

Well - To me the English ( Anglo Saxon ) culture has no 'coulture' of bread - In Italy - France and many other Mediterranean country it is very important -
I make my own bread
http://www.lifeinitaly.com/food/bread.asp
As good as bread is self explenatory to me !- When I first came to the US one of the things I miss the most was eatable bread ( Now available ) and cappuccino ( Now available as well )

I eat 1kg of bread per day, at least.
Bread is the basis of everything in many parts of Italy.