How can i stop my dog chasing after people who is eating food?When I walk with my dog,?

How can i stop my dog chasing after people who is eating food?
When I walk with my dog,

if she see people eat on the bench, she just try to chase them.

She s got a leg dislocation,
so she should be on a diet.This make her hungry, so it makes situation worse.
Is there any solution?
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