A Dietitian’s Guide to Popular Diets

popular diet

Paleo?  Keto?  Blood type diet?   It seems like every week, a different popular diet trend emerges.  As a dietitian, I receive many questions from program participants, family, and friends about how I feel about the newest diet fad.  Luckily, there are two questions that many dietitians and I ask to determine if a diet is based in science and therefore recommended.

  1. Where does the diet stand on allowing or limiting these super foods?
  • Fruits and vegetables
  • Nuts and seeds
  • Whole grains
  • Plant-based oils, primary olive oil
  • Legumes, including beans, peas, lentils, and split peas
  1. Where does the diet stand on allowing or limiting these unhealthy food items?
  • Sugar
  • Red meat
  • Saturated fat
  • Highly processed foods

I have analyzed eight popular diets through the lens of these two questions and listed the PROS, CONS, and whether I would RECOMMEND this diet in the table below:popular diets


1Alkaline Diet: and

2Blood Type Diet:


4Intermittent Fasting: Journal of Nutritional Science, 7, E22. doi:10.1017/jns.2018.13

5Ketogenic: and

6Mediterranean: and


8Whole 30:

Comments on "A Dietitian’s Guide to Popular Diets"

  1. Lee Traub on


    I had Gastric Bypass surgery last year about this same time. I have lost 40 pounds but since my surgery was a redo from a Sleeve they say that is about all I would lose. Do you suggest the DASH diet for someone that has had a Gastric Bypass?

    Lee Traub

    • Kelly Nordby on

      Hi Lee,

      Thank you so much for reading our blogs and for your question. Congratulations on your success after gastric bypass surgery! Please consult your physician and/or Registered Dietitian Nutritionist (RDN) about the best diet to follow for your condition.

  2. Fitoru on

    I really learn a lot of stuff about diet and weight loss. Nice content, good read and informative. Great guide, it is really nice to hear a dietitians opinion about this matters.


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