Most Japanese essentially eat a calorie restricted when following the diet you've outlined. Severely restricting caloric intake has been shown to increase lifespan for all mammals. Of course, adherence is tricky and comes with multiple downsides. Mostly in the form of fertility when younger and being fairly weak when older.
FYI, the recent spat of liver and kidney failure amongst bodybuilders is largely due to the incredible quantity of drugs they are on. A friend is an IFBB card holder and the quantity of gear they run is staggering. The use of diuretics in particular has been behind a lot of the kidney damage we are seeing today.
The Soviet studies on protein intake and athletes showed no downside as long as the use of anabolics was limited. Some of these are available in books like Supertraining by Verkhoshansky. It is of particular interest as most nutritional research in the modern era is crap. A lot of reasons exist for this, but one of the primary one involves the fact that any definitive study would be deemed unethical and probably be cost prohibitive as well.
To do these properly, you would need to keep people in a locked down compound where you can control everything they eat for years at a time. Which is what the Soviets did. And it is also why this research will never be repeated.
Outside of this, researchers have to rely upon what participants report in terms of their diet or on very short term studies. Neither of which give much in the way of useful information. One because people lie, particularly about what they eat. And two, because the duration is too short.
And none of this takes into consideration studies simply being falsified by people with an agenda or poor study design. I've yet to see any study linking meat consumption and things like cancer that controlled for carbohydrate consumption. Because we know obesity is linked with certain forms of cancer.
On the other hand, we know that vegetarian diets in general, and vegan diets in particular, require a pharmaceutical level intervention using supplementary vitamin B-12 to avoid causing neurological (i.e. brain) damage over the long term. These diets are also very low in protein and critically low in things like iron, zinc, calcium, etc. And these are just the things we know about. Supplementation can help with this. But relying upon that long term seems to be a work around more than a good idea.
Three decent population level studies were performed in the last two decades on diet and health. One by the NIH in US, the National Health in the UK and a third one by a leading university in Austria. All three reported the same finding. Vegetarians in general, and vegans in particular, all over represented in terms of every major category of disease and they significantly over represented in the category of mental illness. Now, again, this could simply be that sick people are attracted to diets limited in meat.
I've left a link to the Austrian study. The NIH and National Health reports are behind paywalls.
https://journals.plos.org/plosone/artic ... =printableThe point I'm trying to make is that without a specific issue needing dietary restriction (i.e. epilepsy, autoimmune or allergy related) as omnivores human beings should eat a varied diet. I don't think it's a stretch to advise limiting the intake of highly processed foods simply based off of their unnaturally calorically dense and chemical laden nature. And I count most grains, particularly processed grains, in the same category as they simply haven't been available in the human diet long enough for most ethnic groups to have developed a good ability to handle them.