Earlier quoted context omitted.
Why would they starve? Are skinny students only capable of eating unhealthy, carb-loaded, crap? Most healthy skinny people I know eat fruits, vegetables, and moderate amounts of meat, dairy and carbs, or they run 20 miles a day.
20 miles a day? Surely you aren't serious? Someone check my math but at a 7 minute mile, that's a 2 hour run every day, plus warmup, stretch, change, cleanup time. That feels absurd for anybody with a job, family, etc. Maybe every other day would make more sense.
But that works because cycling isn't weight bearing, so after the initial exponential learning curve you can pretty much do as much of it as you have time and motivation.
20 miles a day of running, on the other hand, is absolutely not typical. Other than ultra-runners no professional does >100mi/wk regularly simply because the diminishing returns don't justify the linear increase in injury risk and aggravation (it's running, injury incidence is already crazy high).