Dietary Instinct, by John Yudkin(from the Penguin Encyclopaedia of Nutrition, 1985)
It is sometimes asked "Why do we need nutritional advice?" Animals in their natural habitat, including our early ancestors, ate the foods that they instinctively chose, and those foods when available must be assumed to have supplied all their nutritional needs; natural selection would otherwise have insured the disappearance of the species. Why then does modern man need to be told how to obtain a balanced diet with fruit and vegetables for vitamin C, meat, fish, eggs, milk, and cheese for protein, and so on?
It has been proposed that this has arisen because man, with his scientific and technological skill, can make extracts from foods, mix them in varying proportions, add synthetic flavours and colours, and so produce new foods, more attractive and sometimes cheaper than many of the foods in their natural state. The qualities of attractiveness do not, however, ensure that the foods contain much, if any, of the necessary nutrients. As a result these new attractive foods may replace other and more nutritious foods in the diet and thus predispose to deficiency, or be eaten in addition to other foods and so predispose to the development of obesity. A further suggestion is that, because the most attractive new foods are those rich in sugar, they lead to an excessive consumption of this undesirable dietary item.
This approach to the question of what is a balanced diet lays stress more on what foods should be avoided than on what foods should be chosen. If the wrong foods are avoided, instinct will determine the amounts and selections from the correct foods. These are the foods than can be gathered, taken out of the soil, or slaughtered: the sorts of foods our ancestors hunted and gathered. They are meat, fish, eggs, fruits and vegetables; because of the constraints of pressure of population and of urbanization, it is usually necessary to add two of the foods introduced in the early days of the agricultural revolution, namely milk and cereal-based foods such as bread. Without these foods it would in many countries be difficult for the less wealthy to get enough to eat.
According to this argument, dietary instinct determines that we choose a food because we like it rather than because we need it. Dietary instinct cannot therefore be relied upon as an appropriate guide for a healthy diet when it is possible for the food manufacturer, and to some extent the skilled cook, to make foods that are increasingly attractive without regard to their wholesomeness or nutritional value.
Does dietary instinct work in captivity, which may be a realistic model for civilization?
In this study, rats self-selecting diet, from weaning to maturity, ate more protein and fat and less carbohydrate than rats fed standard chow.
In self-selecting males, protein intake was maximal at Week 7 of age and then plateaued (Week 13), whereas in females, protein consumption peaked at Week 7 and then steadily decreased. Females showed a strong and early preference for fat, which increased continuously with age. Differences between dietary groups in body fat mass were not observed with the exception of higher subcutaneous fat found in self-selecting rats. Moreover, insulinemia was lower in both male and female self-selecting rats. The high-protein, high-fat diet chosen by the self-selecting rats could be linked to a prevention of the age-related insulin resistance.
Here, in the follow-up from the same group, protein intake was circadian and high intakes are mentioned:
Rats that are allowed to select their diets [dietary self- selection (DSS)2] are able to regulate their daily energy intake, body weight gain, and reproductive cycle (1–4). Broad variations in macronutrient selection nonetheless occur. In the case of protein, the intake required to maintain a stable nitrogen balance and protein turnover in human adults and rats has been established at 10–15% of total energy, and a high protein intake is often considered an unnecessary burden, particularly for the liver and kidneys (5–7) With DSS, rats spontaneously ingest up to 30% or even 50% of their total energy intake in the form of protein.
(I know you'll be wanting references 5-7 from that study, well two are just "WHO Guidelines" and "Dietary Recommendations" type committee-generated rubbish, the only scientific evidence is here, and the abstract doesn't include morbidity or mortality data. Human data is that restricting animal protein is unnecessary and perhaps ill-advised in diabetic kidney disease, and that some hunter-gatherer diets, such as that of the Australian Aborigine, can be very high in protein - 50% or more - see the Drs Eades' Protein Power, p. 46-48)
[Edit 1: RCT (full-text as PDF download) where healthy males were fed 3g meat protein per Kg body weight for 3 weeks. "Healthy young males fed a HP diet improved reaction time. No adverse effects of the HP diet were observed. Branched chain amino acids and phenylalanine in plasma were significantly increased following the HP diet, which may explain the improved reaction time." However, a lower carbohydrate intake was also considered a possible cause of improved reaction times.]
The problem with rat experiments is that rats are never offered much in the way of real foods. It's always a choice between one type of supplemented junk and another with them. If they're lucky they'll get a little bacon or butter, but humane experiments like that are very much the exception.
[Edit 2: here is a rat self-selecting diet experiment that seems to show that a higher sugar content - in this case 37% - of the carbohydrate portion cancels the benefits of dietary self-selection. Much as Yudkin predicted, but without increased caloric intake, indeed on a high-protein (45%) and high-fat diet (protective against IR at 10% sugar but not at 37%).
This reminds me of the "Elegant Solution" Lisle Masden papers where sugar in the diet abrogated the benefits of omega 3 EFAs because of its interaction with linoleic acid; these rat diets would have been high in omega 6, the high protein/lower carb should have been protective, but the presence of sugar - whether as fructose or as "high GI" carb (so to speak) abrogated this]
Are there experiments testing Dietary Instinct in humans? Luckily, such an experiment was run in a Chicago orphanage during the 1920s by Dr Clara M. Davis.
|Bust of Dr Clara M. Davis, France 1918, requisitioned and melted down by German Army in WW2.|
It is discussed here by Canadian science journalist Stephen Strauss:
[the list of foods:
2. sweet milk (i.e. milk)
3. sour milk
4. sea salt
7. orange juice
8. fresh pineapple
27. bone marrow
28. bone jelly
34. fish (haddock)
(some meat and offal was available both cooked and raw, where hygiene permitted, all cereals were boiled, no composite foods such as bread, soup or custard were offered. A wholefood is also a food by itself.)
Average macronutrient disribution chosen was 17% protein, 35% fat, 48% carbohydrate (it would be hard to get a higher fat/protein ratio from the foods available, as there is no butter or oil).
The diet is both nutrient-dense and energy dense, in modern parlance. It is low in PUFA but fructose from fruit is readily available. We can only speculate on the reasons why pork was not included, whether this was a religious convenience or a health based decision.
There is an interesting reference in the paper to a form of dietary self-selection also being used in the Children's Memorial Hospital at that time. Children convalescing from the glandular fever epidemic consumed more carrots, beets, and raw beef. I'm guessing that raw beef and raw offal was not on the menu at the Children's Memorial Hospital, but who knows? In the context of Chicago and Prohibition, all bets are off.
The children were as healthy as 1920's children could be. I wonder if any have written memoirs, and I dearly hope Stephen Strauss completes his promised book on this affair. I know a lot of people who will be interested in that.
So there we have it - cut out sugar, stock the home with real foods only, and watch the appetite go feral.
Some Clara M. Davis from the interweb:
A letter to Clara M. Davis
A 1987 review (paywall)
A good blogger's take, from a baby-led weaning advocate.
A contemporary pop song summed up the healthy 1920's diet: