longevitywatch

Nutrition & prevention

What food, fasting, fibre and supplements really do for healthy aging.

235 answers, from 1,571 studies
Last updated: September 2026
Key questions
What is spermidine and where is it found?
Spermidine is a molecule that occurs naturally in your body, declines with age, and that you also obtain through fermented…
Yes · Moderate evidence
Does quercetin help with hay fever and allergies?
Quercetin has a clear anti-allergic effect in laboratory research, and a small randomised study in humans shows improvement in…
Preliminary evidence
What does quercetin do in your body?
Quercetin has interesting properties in the lab and in small human studies, but whether supplements actually make a difference…
Preliminary evidence
Is the taurine in energy drinks harmful?
Taurine in common energy drinks does not appear to be harmful, but keep an eye on the caffeine: that is the substance from…
No · Moderate evidence
How much taurine do you need per day?
There is no official daily recommendation for taurine alone; the WHO standard of 13 mg/kg/day applies to all…
Moderate evidence
How much magnesium do you need per day?
For an average-weight adult, the guideline is approximately 250 mg of magnesium per day from food; if you cannot reach that…
Yes · Moderate evidence
Do you need to restrict protein intake to protect your kidneys?
If your kidneys are healthy, you do not need to restrict your protein intake. If you have chronic kidney disease, discuss with…
Moderate evidence
Which fermented products have the greatest effect on gut health?
Yoghurt and kefir have the most human evidence supporting a beneficial effect on gut health; for kimchi, kombucha and tempeh,…
Yes · Moderate evidence
Latest articles
11 Sep
Five a day: the number that keeps getting stronger
How much fruit and vegetables do you actually need each day? Research across nearly two million people points to five…
3 min
10 Sep
Motor nerve fibres are weakened by gaps in a support network
Longer nerves break down more easily. That has long been suspected, but the reason remains partly unclear.
1 min
08 Sep
Insulin signalling controls gene reading in kidney cells
Kidney cells that cannot process insulin properly lose more than their metabolism. They also lose the ability to read genes…
1 min
07 Sep
An RNA regulator reverses cognitive decline in Alzheimer’s mice
A protein that normally helps cells process genetic information may play a key role in Alzheimer’s disease. Reducing its…
1 min
07 Sep
Aged brain immune cells secrete a damaging protein
The brain’s own immune cells can become damaged with age. When they do, they release a protein that disrupts surrounding brain…
1 min
07 Sep
A fat cell protein promotes muscle growth in aging rats
Muscle loss with age is one of the most concrete consequences of growing older. A substance that stimulates muscle growth…
1 min
07 Sep
Tumours steal a signal from immune cells
Cancer cells are resourceful. They do not just compete for space and nutrients; they also hijack the molecular signals that…
1 min
06 Sep
A neuron protein may trigger Alzheimer’s early
What if the familiar amyloid plaques are not the first trigger of Alzheimer’s disease, but a different protein is?
2 min
Related topics
Newsletter

Stay in the loop

Twice a week, the most important longevity research in your inbox.