The alternative to this being athletes. We had to carbo-load the night before a game/race/etc -- but not on the regular.
I think those caps are meant to nudge people in the direction of getting their nutrients from non-processed food sources. It's somewhat more reliable to maintain a healthy intake of nutrients by eating food versus supplementation. [1]
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[0] https://beta.theglobeandmail.com/life/health-and-fitness/som...
[1] https://www.health.harvard.edu/staying-healthy/should-you-ge...