Placing a human subject on a high-salt diet can induce insulin resistance within one week.
"if you put a person on a high-salt diet, you can induce insulin resistance fairly quickly, like even within a week." (said at 0:56:00)
No matching published clinical trial or study record evaluating the induction of insulin resistance within one week of a high-salt diet in humans was successfully retrieved within the search query limits. This does not prove the claim false, but means it could not be independently confirmed against the indexed literature during this search.