Not from research. It is a persistent piece of folklore with no clear origin in the evidence, and it ignores the substantial water content of food, which supplies roughly a fifth of total intake for most people.
Studies inducing mild dehydration — around 1 to 2% of body mass — have found measurable effects on mood, perceived fatigue and some cognitive measures in both men and women.
That is a real effect at a modest level of fluid loss, and it is achievable through a hot day or a training session without drinking.
For most people on a normal diet, plain water is adequate. Electrolyte replacement becomes relevant with prolonged heavy sweating — long training sessions, hot-weather physical work, illness with fluid loss.
Magnesium's role in electrolyte balance is one of its authorised nutrient claims, which is one legitimate reason it appears in wellness formulas.
Drink to pale straw. Increase with heat, training and illness. Do not force excessive intake — overhydration is rare but genuinely dangerous, and there is no benefit to being above adequate.
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