Depends on what type.
Basically speaking anything brown is OK. White breads are more processed and contain more sugar than brown breads. This means that eating a lot of white bread can actually give you insulin spikes. These insulin spike make your metabolism work really hard for a short period then it dies off. On the other hand, brown bread is harder to process for the body and your metabolism stays higher for longer. Eating whole foods like brown bread in small amounts throughout the day can help promote a healthy metabolism. Eating large amounts of white breads will have the opposite.
In fact, you're more likely to gain fat eating white bread because your body converts it to energy so quickly and cannot use that energy. This excess energy is stored for later, as fat.
So by all means eat bread, even if you want to lose weight. But keep the portions down
