Dietary consensuses that will be overturned

Just a quick and dirty list. The supporting evidence are left as an exercise for the reader.

1. Dietary cholesterol causes (heart-)disease
2. A high blood cholesterol level causes (heart-)disease
3. Dietary saturated fatty acids cause (heart-)disease
4. All dietary fatty acids cause (heart-)disease
5. Omega-6 fatty acids are essential and therefor healthy [notice the contradiction to the previous point]
6. (Red) meat is unhealthy
7. Grains are healthy

An comment to the above

1. This theory is no longer supported by the scientific community but still lingers on in the public and is repeated by the media.
2. A high blood cholesterol level is one marker (and not even a good one), not a cause
3. Studies either show that partially hydrogenated fatty acids (e.g. vegetable margarine) or sugar have to be added to a diet to cause disease. There are different saturated fatty acids, to show its "unhealthyness" in the lab only one saturated fatty acid is predominantly given – giving a composition of saturated fatty acids found in animals does not cause disease (by itself).
4. Omega-3 and Omega-6 are essential fatty acids. Too little of them is unhealthy. Too much of them is unhealthy. A wrong ratio between them and/or other nutrients is unhealthy. The banal commonplace hat all fatty acids are unhealthy is bullshit. Your vegetable oil will kill you.
5. The Omega-6 fatty acids become unhealthy when the ratio to Omega-3 gets high (higher than 2 to 1)
6. Processed meat is unhealthy. Grain-fed beef is unhealthy. Grass-fed beef is healthy.
7. Studies show that wheat is unhealthy. Studies show that whole grain is healthier than wheat, same as studies would show that heroin is healthier than meth.

Work in progress.