This a summary of an open access article published in Cell: https://www.cell.com/cell/fulltext/S0092-8674(22)00398-1

The longevity diet identifies six steps designed to increase lifespan by promoting lean body mass and healthy blood sugar levels, switching off the body's central pro-ageing system and ramping up an anti-ageing process called autophagy:

1. Limit calorie intake to maintain a body mass index of 22 to 23 for men and 21 to 22 for women.

2. Eat a diet high in wholegrains, legumes and nuts. Stop eating meat to restrict intake of the amino acid methionine, but include some fish.

3. Aim to get between 45 and 60 per cent of calories from non-refined complex carbohydrates, 10 to 15 per cent from plant-based proteins and 25 to 35 per cent from plant-based fats.

4. Do a limited daily fast, eating no calories from around 3 hours before bedtime and for the next 11 to 12 hours.

5. Every two to three months, undertake five days of a fasting-mimicking diet.

6. Alcohol is allowed in small amounts, but no more than 5 units a week.

“I am 52 and, on my current diet, can expect to live another 29 years. But if I change now, I could gain an extra decade and live in good health into my 90s.”

Gaining an extra decade seems perfectly reasonable by taking care of our biological machines.

However, do we really understand enough to know what actually works?

There's only one way: Trying it out.

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He thinks he wants to reach 90, but he might regret doing so. In the end, if he thinks food is the thing that's most important, he'll one day wake up realizing that training the body and mind isn't any less important.

And "no meat" ... yeah, no. Beans, sure. Periods of starvation, yeah.

No meat and thus little to no animal fats? No.

I've seen what it is like to be in your 90s. It's like sitting amongst the empties after the party is over and everyone has gone home. You see some who seem ok, but of course you don't see the rest. Square yourself with dying and enjoy life.

The idea of enjoying life more but dying earlier sounds reasonable in theory but in practice, the things that make you live into your 90s are the same things that make you able to be healthy enough to continue to have an enjoyable life in your 40s-70s, so unless you're planning on dying of a heart attack in your 30s there isn't necessary as much of a trade off as you might think.

In your fantasy world people must be really happy every day, exercising every day and eating very healthy.

Do you mean simply because people outlive their friends? If so, do you think simply having friends that are younger, and possibly still working and having colleagues till a late age, would fix this? Doc Severinsen seems happy in his 90s, outwardly at least. Who knows if he's content behind closed doors. I know a lady from local swimming pool who swims daily who's 91. She's slightly falling apart to be honest ;) But happy and has friends. EDITED or perhaps you mean the many in poor health in care homes who are bored?

Your link just captured the paywall