Answer
Use letters to represent each simple statement in the argument.
p: You eat well.
q: You are healthy.
Express the premises and conclusion symbolically as:
\[\frac{\begin{align}
& p\vee \sim q \\
& p \\
\end{align}}{\therefore q}\ \ \ \ \ \ \frac{\begin{align}
& \text{You must eat well or you will not be healthy}\text{.} \\
& \text{I eat well}\text{.} \\
\end{align}}{\therefore \ \text{I am healthy}\text{.}}\]
The argument is in the form of Misuse of Disjunctive Reasoning.
So, the argument is invalid.
