We talk about how everything in CrossFit is "scalable" to the individual -- that is, we take the same stimulus and treak it to make it work for the individual. The obvious scaling option include less weight, less reps, step-ups on a lower box instead of big box jumps, etc.
Can you "scale" diet? The CrossFit Journal thinks so.
Read: Zero to 60
If you really believe proper nutrition is beneficial to your health and your life, then put on your big-girl panties and keep moving, even if it’s a little uncomfortable. The process will never be totally comfortable until you get to the end, so accept that and keep marching forward. Now let’s take a look at just one of many, many acceptable ways to get you eating right.