Why can’t Hank wear the Ant-Man suit?

Why can’t Hank wear the Ant-Man suit? As soon as Scott gets an explanation about Ant-Man and about what his suit can really do, he also gets the reason why Hank can’t put on the suit himself. Hank Pym has been exposed to the Pym Particles too much and his body has been affected by them.

As soon as Scott gets an explanation about Ant-Man and about what his suit can really do, he also gets the reason why Hank can’t put on the suit himself. Hank Pym has been exposed to the Pym Particles too much and his body has been affected by them.
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