Yoying between dieting and not dieting is bad as it can destroy all your hard work you have done if you go back to just eating junk food again.
Being healthy is a lifestyle choice. Being healthy means you must be committed and it isnt something that you can do one minute and then not do the next. Being healthy is something you must always do.. so yoyoing between dieting and not dieting is a nono. Eat healthy and nutritionally rich meals all the time.. dont slip up ever and eat quick ready meal junk food as this is bad and just having one bad meal can really be detrimental to your health. even if it doesn't seem like it at the time eating empty calories does harm your health as your body's equilibrium knocked out of place and this careful balance needs time to correct itself. So dont wreck your hard work by having junk food every now and again it just is not worth it.