Nutraceuticals in Lipid-Lowering TreatmentPlant sterol/stanol esters may reduce the risk of CHD....
Transcript of Nutraceuticals in Lipid-Lowering TreatmentPlant sterol/stanol esters may reduce the risk of CHD....
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Nutraceuticals in
Lipid-Lowering Treatment
Prof. Manfredi Rizzo, MD, PhD
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The term nutraceutical is a chimerical word,
resulting from the fusion of “nutrition” and
“pharmaceutical”.
it was first formulated by Stephen Defelice
in 1989:
“Nutraceuticals are food or part of a food
that provides medical or health benefits,
including the prevention and/or treatment of
a disease”
Nutraceuticals: Definition
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A “dietary supplement” is a product intended to supplement one or more nutrients,
with the intent of increasing their total daily intake.
A “functional food” is instead defined as a food product to be taken as a part of the
usual diet in order to have beneficial effects that go beyond basic nutritional
function.
Functional foods can be enriched with ingredients that usually are not present in
that particular food, or contain an amount of a specific nutrient larger than usual.
Food and Drugs Administration
(FDA): Definitions
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The European Commission regulates the nutraceutical market through the
European Food Safety Authority (EFSA), which authorizes the labeling of food
products with health claims.
A health claim must be based on accepted scientific evidences, which
demonstrate a significant effect in humans and a cause-and-effect relationship
between the consumption of the food and claimed effect on humans.
European Food Safety
Authority (EFSA):
Regulations
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The literature counts over 40 nutraceuticals with a supposed beneficial effect on
lipid metabolism.
Yet, only few of them have proven efficacy in reducing serum lipids and ultimately
cardiovascular risk.
Many trials investigating the effect of nutraceuticals on lipid metabolism have
important methodological drawbacks in terms of study design, population
characterization and outcome selection.
Nutraceuticals as Lipid-Lowering Treatment
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EVIDENCES FOR:
1. Phytosterols
2. Policosanol
3. Flavonoids
4. Soy Protein
5. Red yeast rice
6. Resveratrol
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Plant sterols (including beta-sitasterol, campesterol and stigmasterol) have similar structure and
cellular function to cholesterol, and are present in vegetable oils, nuts, and seeds. Plant stanols
(beta-sitastanol and campestanol) are saturated derivatives of sterols
Phytosterols compete with cholesterol for intestinal absorption, thus modulating TC levels.
Phytosterols have been added to spreads and vegetable oils (functional margarine, butter, and
cooking oils) as well as yoghurt and other foods.
1. Phytosterols
The dietary intake of plant sterols ranges between
an average of 250 mg/day in Northern Europe to
500 mg/day in Mediterranean countries.
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Phytosterols and plasma lipids:
systematic review and meta-analysis
LITERATURE SEARCH
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Effect of Phytosterols on TC and LDL-C
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Effect of Phytosterols on HDL-C and TG
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Phytosterols and plasma lipids: systematic review and meta-analysis
MAIN RESULTS
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Overall Effect of Phytosterols on LDL-C:
-8.5% relative change vs. placebo
Atherosclerosis
230 (2013) 336e346
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Effect of Plant Sterols vs. Plant Stenols on LDL-C
Atherosclerosis
230 (2013) 336e346
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EFSA: A daily intake of 3g in matrices approved (yellow fat spreads, dairy products,
mayonnaise and salad dressings) lowers LDL-C by 11.3%.
The minimum duration required is 2 to 3 weeks.
EFSA and FDA on Phytosterols
FDA: Plant sterol/stanol esters may reduce the risk of CHD.
Plant sterol/stanol esters in the diet help to lower blood TC and LDL-C.
Daily dietary intake levels associated with reduced risk of CHD are:
≥1.3 g/day of plant sterol esters.
≥3.4 g/day of plant stanol esters.
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Policosanol is an antilipemic agent that includes mixtures of
aliphatic primary alcohols extracted from sugarcane wax.
Its main components are octacosanol (62.9%), triacontanol
(12.6%), and hexacosanol (6.2%).
Policosanol is used for reduction of LDL levels in more than
25 countries, mainly in the Caribbean and South America.
2. Policosanol
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Dose and treatment duration response with Policosanol
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Percent change comparison between Policosanol and Phytosterols
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EFSA: Inconsistent effects on TC and LDL-C.
There is no evidence of a mechanism by which policosanols from sugar cane
wax could exert the claimed effect.
A cause and effect relationship has not been established between the
consumption of policosanols from sugar cane wax and maintenance of
normal blood LDL-C concentrations.
EFSA and FDA on Policosanol
FDA: This product is not intended to diagnose, treat, cure, or prevent any disease.
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Flavonoids (or bioflavonoids) (from the Latin word flavus, meaning yellow - their color in nature)
are a class of plant secondary metabolites.
Flavonoids were referred to as Vitamin P (probably because of the effect they had on the
permeability of vascular capillaries) from the mid-1930s to early 50s, but the term has since
fallen out of use.
Foods with a high flavonoid content include parsley, onions, blueberries and other berries, black
tea, green tea, bananas, all citrus fruits, Ginkgo biloba, red wine, and dark chocolate
3. Flavonoids
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Flavonoid composition of commonly consumed flavonoid-rich food
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Flavonoids and plasma lipids:
systematic review and meta-analysis
LITERATURE SEARCH
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Effect of Flavonoids on LDL-C
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Effect of Flavonoids on HDL-C
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Soy protein has been used since 1959 in foods for its
functional properties. Its popularity has increased due
to the use in health food products.
Soy protein is used in a variety of foods, such as
salad dressings, soups, meat analogues, beverage
powders, cheeses, frozen desserts, whipped topping,
infant formulas, breads, breakfast cereals, pastas,
and pet foods.
Soy protein has a modest LDL-C-lowering effect (3–
5%) and most likely in subjects with hyper-TC.
4. Soy Protein
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Effect of Soy Protein on TC and LDL-C
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EFSA: A cause and effect relationship has not been established between the
consumption of isolated soy protein and a reduction in blood LDL-C.
EFSA and FDA on Soy
FDA: The addition of soy protein to a diet that is low in saturated fat and
cholesterol may help to reduce the risk of CHD.
The food product shall contain at least 6.25 g of soy protein per
reference amount customarily consumed of the food product.
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Red yeast rice (RYR) is a fermented product of rice used
for centuries in China to make rice wine, as a flavor
enhancer, as a food colorant and to “promote digestion
and circulation”.
In RYR there is a substance named monacolin K, which
inhibits cholesterol synthesis with a statin-like mechanism
of action.
Yet, the lipid-lowering effect of RYR effect might be only
partially attributable to monacolin K content. Indeed, RYR
contains about 10 different monacolins as well as
phytosterols (beta-sitosterol and campesterol).
5. Red Yeast Rice
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Red Yeast Rice and plasma lipids:
systematic review and meta-analysis
LITERATURE SEARCH
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Effect of Red Yeast Rice on TC
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Effect of Red Yeast Rice on TG
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Effect of Red Yeast Rice on LDL-C
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Effect of Red Yeast Rice on HDL-C
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EFSA: A cause and effect relationship has been established between the consumption
of monacolin K from red yeast rice and maintenance of normal blood LDL-C.
Daily dietary intake levels associated with the claimed effect:
10 mg of monacolin K from fermented red yeast rice preparations.
EFSA and FDA on Red Yeast Rice
FDA: The red yeast rice powder contains greater than 0.4% lovastatin (monacolin K).
The U.S. District Court for the District of Utah affirmed that red yeast rice
products that contain significant amounts of lovastatin are subject to
regulation as drugs and are not dietary supplements.
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Resveratrol is a natural polyphenol with several health
benefits that is generally contained in grapes and its
derivates, peanuts and berries.
Levels of resveratrol differ considerably between plant
species. In blueberries, resveratrol content is
approximately 32 ng/g, which is lower compared with
levels of up to 2,000 and 3,5000 ng/g in peanuts and
grapes, respectively.
Many credit the ‘French Paradox’, in which moderate wine
consumption was associated with decreased risk of CHD,
as the consequence of red wine’s reasonably high
resveratrol level (up to 14 mg/l).
6. Resveratrol
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Resveratrol and plasma lipids:
systematic review and meta-analysis
LITERATURE SEARCH
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Effect of Resveratrol on LDL-C
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Effect of Resveratrol on HDL-C
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SUMMARY – ALL DATA
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2. Yet, as stated by the ESC/EAS Guidelines:
“Overall, the available evidence on functional foods so far
identified in this field is lacking; the major gap is the
absence of diet-based intervention trials of sufficient
duration to be relevant for the natural history of
dyslipidaemia and CVD.”
CONCLUSIONS
1. Several nutraceuticals have significant effects on plasma lipids, although
not all of them are approved by FDA and EFSA for treating lipid disorders.