I think it's a lot more than that. only lean proteins, whole grains, nuts, seeds, eggs, limited dairy, fruits and vegetables.
common sense eating generally means under 50g (absurd USDA guideline), under 20g of added sugar and generally avoiding animal based saturated fats. that's skipping ice cream, potato chips, crackers, bread, pizza, burgers (buns), tex-mex, cheap pasta, no butter, limited cheeses, choosing wisely at restaurants, etc. That's not too hard to do. 20-50g of added sugar and generally avoiding animal based saturated fats isn't getting any of us to very healthy status in our 50s - 80s ... our genetics might protect us some, exercise too, but if you want to be lean and fit as you age it's sleep, exercise, diet as described, relationships, and hope you've got the good genes.
5 grams or less of added sugar, eat 2 cups of cheerios with no added sugar milk or no added sugar oat milk and you're at 4 grams for the day. added sugar is everywhere except the produce section, nuts, seeds, eggs and unprepared raw meats, fish and poultry. whole grains, you have to scrutinize the label. go to the cereal aisle. you'll find maybe 3-4 selections in the entire aisle that have under 5g of added sugar in a small serving size. it's insane.
if your household isn't on board with an anti-inflammatory diet, it's really hard to accomplish. simply put - in the US, an under 5g per day of added sugar and virtually no animal based saturated fat diet is ridiculously difficult - but it is doable.
all of that said, my 5 months on this diet was incredible. I never felt more healthy in my life, all the while I was still pretty ill with covid but recovering. I would stay on this diet if I could convince my family, but I can't. So I'm going to try and manage through it. this week is a strict week as I added 5 pounds the last month.