Dead Comment
While the inverse occasionally has been true, generally people who I consider in good shape appear to eat less, and less greasy food.
So while there might be exceptions it seems to be a damn good rule of thumb to me.
Your question isn't refuting OPs claim: the people you are observing to be fat are fat because of their carb/sugar intake, not fat.
i.e. if you just fed someone large amounts of protein and fat they would be lean; it is the sugar and carbs that make them fat.
If you're a junior, you should already have marketable skills. You need to start earning something ASAP, even if it's applying to every scholarship under the sun. I don't know why/how you're taking for granted that you'll even be hirable in a big tech company right out of school, especially making enough to cover an extra $30k+ in loan payments every year.
300k over 30 years is ~21k in interest per year. Over 10 years its ~17.5k a year.
But yeah, that's a lot. I'm curious how one racks up $300k at a state school. I just checked a few state schools in New York and their out of state tuition is ~7k a year?
$300k is enough to have gotten a degree from the most expensive private school in the US (Harvey Mudd).
But to answer the OP: absolutely do not start a company. Get a job and pay your loans off.
you just need to grasp the basics.
Phil Gordon's Little Green Book and The Theory of Poker (Sklansky) are common recommendations.
An industry with a 90% 10yr failure rate isn't one where the majority of its members embody wisdom and foresight.
So there's counterexamples to internal tools being good products. But most are bad, just as most external tools are also bad startups.