Before revision: The second possibility is that the link between saturated fats and CHD is valid, but that some additional factor in the typical Israeli diet, lifestyle or genes creates another CHD risk—presumably with the implication that if this factor can be identified, it can be isolated in the diet and / or lifestyle of other countries, thereby allowing both the Israelis, and others, to avoid that particular risk.
After revision: The second possibility is that the link between saturated fats and CHD is valid, but that some additional factor in the typical Israeli diet, lifestyle or genes creates another CHD risk—presumably with the implication that if this factor can be identified, it can be isolated in the diet or lifestyle of other countries, thereby allowing both the Israelis, and others, to avoid that particular risk.