I had a nutrition professor that sounds similar:
"Cancer is like a thief. Thieves prefer to steal from expensive mansions, rather than poor wooden shacks. Therefore, if your diet is too healthy or too perfect, you are really risking cancer because cancer wants your nutrients. That is why 3rd world countries don't experience cancer."
"If anyone (other than a burn victim) eats more than 60g of protein a day, they will suffer kidney damage."
"Removing fat from your diet is the healthiest and best way to lose weight, because a gram of fat is 9 calories and a gram of carb is 4 calories. It's just math."
"Don't waste money on organic foods because pesticides are only designed to hurt bugs."
"BMI measurements are the best way to know if someone needs to lose weight. Michael Phelps has a BMI of 41, and thus is morbidly obese. I would recommend that he reduce his calories until his BMI is reasonable."
Absolutely repeated everything this woman said to get the A, because after screwing around for a couple years I finally realized how important your grades are. I second the idea of setting office hours to ask more questions about whether he is diluting information or teaching what he learned.
Also be prepared for the idea that A LOT of teachers teach what they learned in school, or teach out of the textbook that their Department Head/Chair tells them to, sometimes with the power points already written and made mandatory.
One of the problems of science, is the politics that get involved. Good Calories, Bad Calories is a great book talking about how the current nutritional thinking has come into being, and why it is inaccurate based on the very studies that made it "fact".
As someone said before, not all Ph.D's are created equal. A Ph.D is a degree showing that you met the requirements of time and energy that an accredited school deemed necessary. It does not indicate that you are an expert in your field, nor that you are up to date on current thoughts and research in your field, nor that you are of above average intelligence. It means that you worked harder for longer than most college students and spent a lot more money getting your degree.