i hate posts where you have to login to see the full article

Me too. But if anything is worth having a login, it's nytimes.com. Login once and you won't be prompted to login again.

Use bugmenot and you won't have to log in agains either.

Compulsory logins are stupid; all they achieve is alienating people. Whenever I have had to do one, I've deliberately given false information to pay them back for their obnoxiousness.

Summary?

Poor regulation of blood sugar can negatively affect memory. As we age, regulation of blood sugar gets worse possibly explaining the correlation between age and cognitive decline Exercise helps regulate blood sugar. Recommendation - you should exercise.

I'm not sure 24/7 pegging your blood sugar all the way to 11 is what they were thinking of as 'controlled blood sugar'...

Minimizing sugar and starch intake is far more effective than exercise in this regard.