I am getting ready to be a nutrisionist and from my opinion, the bad stuff in a Big Mac is the fat (saturated and trans) and also the white bread that gets stuck in your stomach and takes a lot of time to get out of the body so it's also a problem. And the vegetables are probably converted somehow (added bad nutrients to it)
White bread is actually digested rapidly, which is one of the three things that makes it worse than brown/whole grain bread. The first thing is that since the white bread lacks the fiber that was processed out and has no protein, which is why it’s absorbed rapidly. This brings it to the next thing, which is that it spikes the blood sugar levels and to keep you filled this isn’t what you want. White bread is also missing a lot of the vitamins that are found in bread that uses the outer shell of wheat as well. That being said in moderation it is completely fine, but overeating is a major contributor to many health issues.
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