> McDonalds certainly doesn't suggest that you do that
I thought part of the problem was that McDonalds /did/ suggest you /could/ do that, without any ill-effects - that their meals were healthy and you could eat breakfast, lunch and dinner there without a problem.
McDonalds never claimed that their food could be consumed to the exclusion of every other possible food. They offer breakfast options, but none of their marketing made the claim that eating at McDonalds every day was recommended.
On the other hand, soylent is making the claim that it's healthy to use soylent as a complete replacement for food. Thus, the standards are much higher in terms of truth in marketing.
I appreciate that there's a difference in marketing, and McDs isn't actively suggesting you should eat there everyday (unlike Soylent), but take a look at this page:
There's no mention of food from other places, and the final paragraph ("Variety keeps things interesting") certainly implies you could eat there daily without problem, to the exclusion of other food sources.
I thought part of the problem was that McDonalds /did/ suggest you /could/ do that, without any ill-effects - that their meals were healthy and you could eat breakfast, lunch and dinner there without a problem.