They eat that stuff every day and it can’t be any better for them than it is for us. Do they weigh more than birds that eat a healthier diet?
In humans, heart disease takes decades to develop. I don’t think birds live long enough for it to be a problem. They have higher metabolisms than we do, so they probably burn calories pretty quickly. I would expect nutritional deficiencies to be more of a problem than obesity. Birds tend to travel quite a bit, so I suspect they could pick up nutrients from other food sources in their territory.
not sure ‘bout their heart, but there are warning signs near a pond by me that states something like - ‘please don’t feed the pigions, ducks, swans bread’ and goes on ’ the birds eat the bread and they don’t look for more nutrishious foods (bugs) and basically starve’
much like the startrek ‘trouble w/ tribbles’ episode.
I thought that the reason you don’t feed ducks bread is because the water can swell up the bread in their throat and they can suffocate.