Judging by your post, I think by using the word healthy, you are using it as meaning "does not contribute negatively to your health." The actual definition is of the word is:
"indicative of, conducive to, or promoting good health."
Using the actual definition, there is nothing about cutting weight that is conducive to good health.
According to a 2013 Fightland
interview with Dr. Michael Kelly, the cutting/replenishing process fighters go through before a match can cause cardiac arrest:
"
[T]he electrolyte balance is normally very tightly regulated by your kidneys—your sodium, potassium, magnesium, and calcium are probably the most important--and you put a big strain on your kidneys trying to maintain not only the fluid balance but the electrolyte balances. And when you have an influx of water and calories after a weight cut in some people the body can't accommodate that as fast as would normally be required, so they end up with relative deficiencies, for example the ratio of sodium to potassium or sodium to calcium become off. And if they become abnormal enough, you could end up with cardiac arrest. All the cells in our body, especially in the electrical impulses, rely on a very delicate balance of sodium and potassium. The sodium/potassium pump propagates a nerve signal along the axon, or in the heart along the cardiac fibers that conduct electricity in the heart. So if those signals aren't propagating along the channel correctly, the heart can go into an irregular heartbeat or fatal heart rhythm and wind up in cardiac arrest."
https://sports.vice.com/en_ca/article/nzxj78/cutting-weight-cuts-a-young-life-short
So throwing off your electrolyte balance through the replenishing process (sodium to potassium or sodium to calcium ratios) is detrimental to your health and does NOT promote good health in any way whatsoever. In extreme cases, this leads to cardiac arrest. Sounds really healthy!
Even a relatively easy or "well managed cut" still puts a strain on your body.
"Weight-cutting is as fundamental a part of MMA as jiu-jitsu--part of the warrior's code of sacrifice, if you will--so it seemed like the right time to ask our fight doctor, Dr. Michael Kelly--a sports-medicine specialist, part-time ringside doctor, and the author of the book Fight Medicine--what's going on with the human body in the midst of that kind of extreme dehydration.]
Dr. Kelly: The issue here comes down to electrolyte balances. Most of the water we carry in our bodies is in our muscles. So when you start decreasing the fluid content in the muscles, that causes the efficiency of all the enzymes and the concentration of electrolytes and glucose and all the things that are necessary for normal muscle function—all those concentrations are off when you’re doing these massive fluxes in fluid. We know from studies that you’re not as strong and your endurance goes down markedly. You see a fighter who drops a lot of water weight very quickly they burn out very quick: First round, they’re done, they’re spent, they have no reserves.
That's why it's so important for these guys to be smart about the way they cut weight, not to do too much too fast. A smart weight cut is still hard on the body but won't have the same kind of negative effects"
A leading expert clearly specifies that "a smart weight cut is still hard on the body." Yeah really healthy bro!
For very obvious reasons, weight cutting is not healthy. In fact it is the opposite of healthy, using the actual definition of the word. Even with a more generous interpretation of your use of the word healthy, it doesn't meet the standard.
Take it easy on McGregor .gifs next time, kiddo.
