By definition, high fat is too high and low fat is too low. What we want is just the right amount of each type of fat and thus the right amount of total fat.
The bull’s-eye diet is not high in fat, but it is higher in fat than most experts believe is healthy. It is way higher in fat than the low-fat vegan diet many believe is optimal, at least for heart health.
Because most people are under-nourished, they cannot find the optimal level of fat in their food using as guides either their taste buds or the meal’s ability to suppress their appetite for at least 6 hours. Any meal that can suppress appetite for at least 6 hours must have sufficient calories, sufficient protein and sufficient fat. Sufficient calories alone does not remove the sufficient protein and sufficient fat requirements. Low fat, low protein vegan dieting is running uphill when it comes to suppressing the appetite.
F, The amount of fat we need per meal, is that amount that will accomplish at least all of the following:
1. Form a good micellar emulsion with water and bile and other emulsifiers (like choline) and all of the useful and absorbable fat soluble substances and amphipathic substances (essential nutrients like linoleic acid and linolenic acid and vitamins D, E, A, and K), conditionally essential nutrients, and accessory nutrients like carotenoids and the amphipathic substance vitamin P [and biotin?]) in foods and supplements, resulting in sufficient absorption of these nutrients. Call this F1.
2. Satisfy our well-nourished appetite suppression system for many hours so that we are not gaining weight by giving in to hunger frequently. One meal a day is ideal, as in the Fast-5 approach. Two meals are better than three. So we are talking about satisfying the appetite for 6 hours (for three meals) or 12 hours (two meals) to 19 hours (1 meal per day). Call this F2.
3. Completely empty our gall bladders, so important because our gall bladders store 10-20 concentrated organic toxins and amphipathic toxins from the liver. Call this amount F3.
4. Provide sufficient antimicrobial activity in the lumen of the stomach in the presence of stomach acid – 6 log killing can be achieved with 1 mM free fatty acid at pH 3, while 10 mM free fatty acid can achieve almost the same at pH 4.5 (C.Q. Sun et al. / FEMS Immunology and Medical Microbiology 36 (2003) 9-17). Call this amount of fat F4. Salivary serous gland lipase (the principle products of this enzyme are free fatty acids and diacylglycerols) is able to penetrate fat globules and is thus active without the need for bile and in the presence of acid, down to at least pH 4.5 – so considerable digestion can occur right after eating a meal with sufficient fat before the stomach contents are acidified down to where pepsin is optimal.
5. Provide a well-nourished taste bud system with good taste – not too little fat, which does not taste good, and not too much, which tastes greasy. This satisfaction of the taste requirements also contributes in a virtuous circle to appetite suppression and mood stabilization later on. Call this amount F5.
6. Provide sufficient fat for mood stabilization (helps prevent depression, likely taste bud satisfaction contributes to a better overall mood). Call this F6.
7. Provide sufficient fat for lubrication in enteric and non-enteric tissues. Call this F7.
Is F=F1=F2=F3=F4=F5=F6=F7? Don’t know, but it would be fascinating if it worked out that way or even approximately the same. Would be fascinating if F is also the amount of fat that we can digest by salivary lipase and gastric lipases, and absorb without making either new enzymes (salivary, gastric, or pancreatic lipases) or more bile. This amount of fat may decrease as we age. We may need to supplement digestive enzymes as we age and stimulate our digestive process (with all natural digestive bitters, e.g.) in any way we can.
Note that our well-nourished bodies also tell us when we consume too much fat. Too much fat not only tastes greasy, but it makes stool float and at an even greater excess too much fat in the diet results in smelly diarrhea. Too much fat may also promote feelings ranging from mild anxiety to outright panic attack, and from mild nausea to vomiting.
How could any reasonably intelligent person fail to read these signals? The body is clearly saying that too much fat is not good for the body.
Stating the obvious once more: an undernourished person may have such reactions to too low a level of fat in his diet. Only a properly nourished body has properly functioning taste buds, appetite satiation, and appropriate responses to too little fat and protein, and too much fat and protein.