I am wondering if my thesis statement sound solid?

How old are you? Do you understand the assumption made by calling a child’s mind feeble? Is English your native tongue? (children’s obesity; statement sounds defendable. etc.)

As children are feeble-minded individuals, they cannot be held fully responsible for maintaining their health. Adults must set the standard for proper diet and exercise for their children to follow.

Look up feeble-minded in the dictionary and it says lacking normal mental powers, mentally retarded, and stupid. Although this may apply to many of my supervisors, I think you might seek better wording to describe the mental capacties of children in general.

Maybe something like: “With the wide range of distractions and availability of unhealthy food it is important for a parent to monitor the behavior of their children.”

That is still bad. I just woke up.

@Jp :That is far superior to the querent’s statement. (The idiom is “availability of unhealthy foods.”)

I would change “feeble” to “undeveloped” or “immature”