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Yeah, this is exactly the kind of argument Harris makes that I don't buy. :)
There is no particular thing that tells us that what is "unhealthy" is also "immoral" (or contrapositively). Science can't tell us that, we just have to agree (or not).
In general there's no particular consensus on even this simple case as a general principle; I would be healthier if I exercised more (science can tell me that), but that doesn't necessarily have any moral consequences at all.
Science can tell us that a certain concentration of heavy metals in the environment is likely to cause certain effects on people. The extent to which this means that any particular action by anyone is immoral is outside the field of science.
