I registered to the journal so I was able to access the paper.
Here are my thoughts
As discussed above, it seems to be that a person very dedicated to health and longevity optimization in general can to a very large extent minimize risks of heart disease, stroke, diabetes, fatty liver, kidney issues, frailty, etc.
That shifts a lot of the remaining risk to cancer, and neurodegeneration, where AD is by far the biggest and least controllable.
Still, this consensus paper in a conservative journal maps out that at least 35% of the risks of AD is modifiable and that another 7% of risks is connecting to having ApoE4 or not
So from the start in my case for instance I’m close to the
35% modifiable
7% ApoE 4 (I don’t have, but also likely that we will be able to gene editing in time for many even if they have)
= 42% modifiable that they have calibrations for
And there are a lot of things that are modifiable that they just could not quantify and hence did not include in their calculations above, for instance:
Sleep might promote repair of damage caused by other factors, but given the absence of systematic reviews or enough consistent, high-quality evidence, we have not been able to include sleep in our calculations of PAF.
If you look at other sections on this forum you’ll see a lot of data and reasons for why optimal sleep likely can have a massive impact on neurodegeneration be disease including AD.
There a lot of other things like that, in fact in their own figure below only some of the the things they have quantified even if they show in the figures other things that have an impact.
Including that they similarly to sleep have not calculated what the impact of an optimal exercise regime is. Exercise’s impact on AD is likely huge, even if we don’t have an estimate for how big.
The same is true for food, optimized diets vs crappy average western diets likely have a large impact over decades even on things like AD. Still, they do not include that in either the first figure above or even the somewhat more compressive one elsewhere. (Although they come back to it later in Table 2 where the calculate its modifiable impact to ~8.7%)
They also mention alcohol, pollution/living near major roads, etc impacting AD risk - none which they include in their numbers.
In this world where in for instance my case applying the paper’s known numbers in seem to have taken out 50.2% of the quantified risk for me and I also would score very well on the sleep, exercise, etc, etc categories that they list, but don’t include in their numbers, not to mention a whole range of other categories they don’t even mentioned.
So in this situation - after reading the lancet paper you referred to it seems like the impact for someone like me and others on this that aggressively are optimizing health and longevity and cutting risks of ally the things lost on the intro of this post AND also to a large (r extent that I I tally expected) also of AD, a cure for all cancer really would be huge and in expectation highly like more than 3 years of extra (healthy) life.