Valter Longo is perhaps most well known for his work on fasting. Specifically his 5 day fast mimicking diet. However, he doesn’t expect you to fast all year round! To provide a solution whilst you’re not fasting, Valter has created The Longevity Diet (book). It details a diet with a proven track record of facilitating people to become centenarians. This post will be split into two sections:

  • Fast Mimicking Diet – Valter’s fasting diet details
  • The Longevity Diet – Valter’s suggestions for how to eat daily

Fast Mimicking Diet

The fast mimicking diet is designed so you get the benefits of a 5 day water fast, whilst still being able to eat something each day. Valter and his colleagues at USC (University of Southern California) have patented and designed an out of the box 5 day ‘fast mimicking diet’ (FMD). This can be purchased in the USA from for $249, and in UK from for £225. For many people, the easiest way to do the fast will be to simply purchase it and follow the instructions.

Fast Mimicking Diet DIY – Method 1

For those who prefer not to spend $249 on 5 days of “food”, or for some other reason, would like to DIY it,  it’s definitely possible. The FMD diet is approximately* the below:

  • Day 1: 1100 calories (13% protein, 51% carbohydrate, 36% fat)
  • Days 2 to 5:  670 calories (11% protein, 60% carbohydrate, 28% fat)

That’s the calories and macros, additionally the diet adds:

  • Days 2 to 5 adds a potassium fortified drink, because fasting can reduce potassium levels, so supplementing this avoids any side effects
  • Days 1 to 5 add a multivitamin daily
  • Days 1 & 5  add 200mg DHA oil each day

*The reason for the approximation, is that days 2-5 mixes the menu up each day ever so slightly (to provide variation), and thus the calorie/macro counts are not 100% the same across all those days.

Essentially day 1 offers a noticeably higher calorie intake (~1100), and days 2 to 5 keep it at around 700 calories each day.

Its important to keep roughly approximate to the macros used by the FMD diet for two reasons. Go too high on protein, and you might negate the reduced IGF-1 levels the diet achieves. And go too high on the carbs, and you’ll potentially reduce the amount of ketosis.

I’ve created two pages that could be useful when figuring out the details for your DIY FMD diet.

  • The first is a set of tables that provide the blow by blow macros and calories for each day of the official FMD diet.
  • The second is details of the individual products in the FMD diet, with their respective nutritional information.

The Longevity Diet

In creating The Longevity Diet, Valter travelled around the world studying centenarians. He put together a formula he calls the Five Pillars of Longevity. Diet principles had to clear all 5 of the pillars to be viewed as viable long term possibilities. For example, take the recent fad of ketogenic diets. Whilst ketosis is very successful at weight loss, and has positive health benefits in clinical trials, there are no populations of people that have eaten this diet and regularly lived to become centenarians. Pillar 4 requires there to be evidence that centenarians have eaten a particular diet. Now, that doesn’t mean it isn’t possible for people to eat a ketogenic diet their whole life and live past 100, it just means we don’t yet have a long enough timeline of experimentation yet. For sure, there will be some that are happy to take risks and live on untested diets. But others will feel more at ease to stick with the tried and tested.

Below lets look at three key aspects to Valter’s book. Firstly, lets compare this diet to one you may be familiar with; the Mediterranean diet. Then lets look at his 5 pillars of longevity approach and what that means. Lastly, lets look at the longevity diet rules for eating.

Differences Between the Optimal Mediterranean Diet and the Longevity Diet

 Mediterranean DietLongevity Diet
Olive OilHighHigh
Unrefined CerealsHighHigh
FruitsHighLow until old age, then higher
CheeseModerateAbsent/very low
YogurtModerateLow until age 65-70, then moderate
Meat & meat productsLowAbsent/very low
MilkLowAbsent/very low
EggsLowAbsent/very low until age 65-70, then moderate
ButterLowAbsent/very low
Protein levelsNot addressedLow until age 65-70, then moderate
General food consumptionNot addressedNormal until age 65-70, then sufficient to maintain a healthy muscle mass
Time-restricted feedingNot addressed11-12 hr eating window central to plan

Table credit – The Longevity Diet Book by Valter Longo

It’s worth pointing out some key aspects of the diet:

  • It emphasises low protein. No animal meat, with fish around 3x per week (the guideline is 0.31 to 0.36 grams of protein per pound of body weight per day)
  • Essentially no dairy, perhaps just a small amount
  • It uses an 11-12 hour eating window

The 5 Pillars of Longevity

Image source: The Longevity Diet Book by Valter Longo

Pillar 1: Basic/juventology research

This pillar covers the scientific lab work done on simple cells and animals. Helping to establish the fundamental properties of organisms and how dietary interventions affect them. Every theory starts off here, and if successful, could later make its way to human tests.

Pillar 2: Epidemiology

This is the study of what happens to specific groups of people “in the wild”. For example, the first known epidemiological study was by John Snow (GoT anyone?!). He noticed that two areas of London had significantly higher death rates than elsewhere, and was able to pin it down to a specific water pump that provided both areas with water. By using Chlorine to clean the water, he solved the problem. So essentially Valter believes that we need to cross-check our theories with active populations to understand how they affect people.

Pillar 3 – Clinical studies

Clinical studies are the next steps after looking at both basic lab research and epidemiological studies. And are essential for comparing a theory against a control group. So for example, you could test a particular diet intervention in one group of subjects, and have another group who are similar in age, weight etc., but don’t follow the particular diet intervention. That way you can tell what effect, if any, the intervention has.

Pillar 4 – Centenarian studies

This pillar essentially covers epidemiological studies of specific “blue zone” populations. Blue zone just refers to an area of people that commonly live past 100. Even if a diet makes it past the first 3 pillars, its important to look at real world longitudinal studies for confirmation a diet is safe and effective long term. In order to do this, Valter studied long-lived populations in Ecuador and southern Italy and consulted the work of his colleagues focusing on other very long-lived populations.

Pillar 5 – Studies of complex systems

Valter describes this last pillar as a way of viewing the complexity of a human body as a whole. Taking simple models of function/loss of function, and plugging them into the wider system to see how they operate. Helping to understand the complex interactions between food, cellular damage and ageing. I don’t think I’ve done a great job of describing this, and I think it comes down to its level of abstraction. Its more a method of thinking about the human body, versus a formulaic methodology (as with the previous 4).

The Longevity Diet Rules:

1. Eat a mostly vegan diet with some fish:
Strive for a 100 percent plant- and fish-based diet, but limit fish consumption to two or three meals a week and avoid fish with high mercury content. After age sixty-five to seventy, if you start losing muscle mass, strength, and weight, add more fish and fruit and introduce animal-based foods like eggs, cheese, and yogurt made from sheep’s or goat’s milk.

2. Consume low but sufficient proteins:
Consume approximately 0.31 to 0.36 grams of protein per pound of body weight per day. If you weigh 100 pounds, that is about 31 to 36 grams of protein per day, of which 30 grams should be consumed in a single meal to maximize muscle synthesis. If you weigh 200 pounds and have 35 percent body fat, 60 grams of protein per day are instead sufficient, considering that it is the lean body mass that utilizes most of the proteins. Protein intake should be raised slightly after age sixty-five to seventy in individuals who are losing weight and muscle.

3. Minimize bad fats and sugars, and maximize good fats and complex carbs:
The diet should be rich in “good” unsaturated fats, including those from salmon, almonds, and walnuts, but very poor in “bad” saturated, hydrogenated, and trans fats. Likewise, the diet should be rich in complex carbohydrates, such as those provided by whole bread and vegetables, but poor in sugars and limited in pasta, rice, white bread, fruit juices, and fruits containing carbohydrates that are easily converted into simple sugars. Finally, the diet should be low in animal proteins but relatively high in vegetable proteins, in order to minimize the former’s negative effects on diseases and maximize the latter’s nourishing effects.

4. Be nourished:
The body needs protein, essential fatty acids (omega-3 and omega-6), minerals, vitamins, and sufficient sugar to fight the many wars going on inside and outside cells. To be sure you get enough nutrients, every three days take a multivitamin and a mineral pill, plus an omega-3 fish oil soft gel purchased from a reputable manufacturer.

5. Eat at the table of your ancestors:
Consume a variety of foods to take in all the required nutrients, but choose the ones that were common on the table of your parents, grandparents, and great-grandparents, so long as they are included in the Longevity Diet.

6. Eat twice a day plus a snack:
Unless your waist circumference and body weight are in the normal or low range, it is best to eat breakfast plus one other meal a day and one low-calorie, low-sugar, nourishing snack. If your weight or muscle mass is too low, then eat three meals a day plus a snack.

7. Time-restricted eating:
Restrict your eating to eleven to twelve hours or less per day. For example, if you eat breakfast after 8 a.m., finish dinner before 8 p.m. Shorter periods of feeding (ten hours or less) have been shown to be even more effective in promoting health, but they are much more difficult to comply with and may increase the risk of side effects, such as the formation of gallstones.

8. Periodic prolonged fasting-mimicking diets:
People who are under seventy years of age, not frail or malnourished, and free of certain diseases should undergo five-day periods during which they consume a relatively high-calorie fasting-mimicking diet. An FMD may also be appropriate for older people, but only if needed and if a medical doctor recommends it.

9. Follow steps 1 through 8 in such a way that you reach and maintain a waist circumference of less than 35.5 inches for men and less than 29.5 inches for women. This is higher than the ideal 33 inches and 27 inches cited earlier, but it is more realistic and should still be very effective in reducing disease risk while avoiding malnourishment.

Exercise for Longevity

Walk fast one hour per day. Take the stairs instead of escalators and elevators, even if you have to go up many flights. On the weekend, try to walk, even to faraway places, but avoid polluted areas. Do moderate exercise for 2.5 hours a week, some of it in the vigorous range. Do weight training or weight-free exercises to strengthen muscles (combined with 30 grams of protein intake following the weight training).

Posted by Alex

Hi, I'm Alex, a medical student, with a broad interest in nutrition, hormones, cancer prevention and gerontology (study of ageing). I write this blog to answer questions I myself have had at one stage or another. With the hope that others find it useful.


  1. […] would like to learn about making your own DIY version, I’ve written a further post about this here. In particular, check the two bullet points at the end of the first section, where I’ve […]


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