The Longevity Stack, Ranked by Evidence

Winter vitamin D did not lower heart attack, stroke or cancer in a 25,871 person trial

Vitamin D is pushed every winter, but in the VITAL trial, 25,871 US adults aged 50 and over, not selected for low vitamin D, taking 2,000 IU a day for about five years saw no drop in cancer, heart attack or stroke. It still matters if you are genuinely low, so the move is a blood test first and supplementing with your clinician if the number calls for it, not a bottle bought on the season.

Vibration plates alone did not cut body fat across 20 trials

The plate that shakes while you stand on it is sold as a shortcut to fat loss. Across 20 randomized trials with 585 people, weight and body fat did not change meaningfully overall; a subgroup aged 50 and over showed a possible fat reduction that needs confirming. The review did not compare plates with other exercise, but for fat loss, regular activity and what you eat have the stronger evidence base.

High fitness beat quitting smoking for survival odds

Mandsager et al., JAMA Network Open 2018, followed more than 122,000 adults who had done a treadmill test, and elite cardiorespiratory fitness was associated with a larger reduction in all cause mortality risk than the reduction seen from not smoking. The benefit kept going with no observed upper limit, which is unusual. It is an observational cohort, so it shows association and cannot prove that raising your VO2 max adds years. Peter Attia's own translation of this into three to four hours a week of zone 2 plus some work near VO2 max is his program, not the thing the study measured.

Muscle and strength are your healthspan lever

Peter Attia points to resistance training with adequate protein as one of the biggest levers on healthspan: it preserves the muscle mass and strength that predict how well people function later in life. The training-and-protein-builds-muscle part is well supported by human trials. The idea that this literally extends how long you live is not established: that is association from observational data, not a proven causal effect, so we are making a healthspan claim here, not a lifespan one.

A creatine loading phase gets you results faster, not just eventually

A randomized trial in strength-trained men found a short-term creatine loading phase improved total work and repetitions to failure faster than starting at a flat maintenance dose. It did not change load-velocity characteristics such as bar speed, and the trial was in already strength-trained men over a short period, so it speaks to volume and endurance-to-failure gains, not maximal single-rep strength. One RCT in a specific population, not a universal result.

Fitness predicts your lifespan better than smoking

A study of over 122,000 people who did treadmill testing found cardiorespiratory fitness tracked survival more strongly than any of the traditional risk factors it was compared against, including smoking, diabetes and high blood pressure. The gap between the least fit group and everyone else was the largest single jump, so the biggest return is at the bottom of the range, not the top. This is observational, so it shows a strong and consistent association rather than proof that raising your fitness causes the extra years. The practical read is that moving from unfit to moderately fit is the change that matters most, and it costs nothing.