^^ Yeah, it's quite humorous how he worded that, kinda seems to contradict himself. But notice the blatant bias in this statement "...it can be heavy on red meat and other fatty, processed, and salty foods that are notoriously unhealthy." He's openly characterizing ketosis as a 'popular diet' and 'fad diet' while also questioning sustainability over long term... Like I've said it's a lifestyle not a diet. I'm somewhat liberal in my nutrition regime and the only really processed foods I eat are the same as any other low-fat food-pyramid American diet (coffee, occasional cold cuts, diet soda, adult beverage) but I eat less of that now than before. I suppose technically my C8 MCT oil and olive oils are processed, but I buy the cold-processed without use of solvents. I suppose maybe he's mistaking my diet of veggies (organic when available), grass-fed butter and steak, free-range chicken, fish, nuts, and dairy as processed in some way too... Interesting that most processed foods include sugar in some form and the labels often obscure this with the various names of sugar. Eliminating sugar is one of the best ways to avoid processed foods. So...obviously he doesn't know what low-carb folks eat. I'd be inclined to laugh it off as written by someone who 'drank the cool-aid' but unfortunately it's not funny. His article certainly gives an appearance of credibility because he's an MD associated with Harvard but in the end its simply a biased editorial/opinion piece espousing traditional food pyramid.
There are some peculiar politics within the medical community. One physician friend told me they needed to be very careful and guarded about what they say or publish about keto for fear of being sanctioned... I firmly believe most all MD's are very well-meaning but I can't ignore studies that show anywhere from a 15-25 year lag from medical research to patient treatment (bench to bedside). An extreme example was a 25-year lag from research of beta-blockers to the actual treatment of patients. Dr. Ancel Keys Seven Countries study was refuted around 2015, so at this rate it'll be about 2030 by the time medical practice catches up and endorses low carb... Of course, that's another discussion that tends to divide and inflame, and it always seems to goes tit-for-tat. For every article showing a lag, another article purports more or less lag, and some might even cite a dire necessity to proceed more slowly for caution...
People are creatures of habit, we fear and resist change. We compare with old knowledge and try fit new knowledge into familiar categories and constructs. MD's are no different, very well-meaning, but nonetheless they're just people too. He's sharing what he believes to be correct, his truth, and I certainly can't fault that. The wheels of medicine turn slowly. Critically read the most credible articles you can find; look for bias and tear them apart. Dig deeper and read their source articles, and the sources of the sources, etc. The answers are there, decide for yourself, live your own truth, and be well!