oats: healthy, nutritious and sustainable - and fit into a ... · therefore, the risk of gluten...
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Oats: healthy, nutritious and sustainable - and fit into a gluten-free diet
Luud Gilissen Impulse WUR 20 April 2016
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Content
History Field and Feed Health and prevention of chronic diseases Gluten-free diet The Dutch Oat Chain Conclusions and tastings
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Oat within the grass family
Wheat, rye and barley are the gluten-containing
cereals
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History of cereal consumption
Fossil records: ● ~6 Mya: Early hominids diverged from apes due to specialized feeding on small
and hard grass (cereal) seeds (molar shape and thick enamel) (Straight, 1997; Sponheimer & Lee-Thorpe, 1999; Senut at al 2001)
● ~1.5 Mya: Homo sp increased the fraction of C4-based resources (= cereals) in the diet (Cerling et al 2013)
● 120.000 ya: meeting of Neanderthals and modern humans in the Levant (Iran/Iraq region) where wheat, barley and oat species are endemic (Kuhlwilm et al 2016)
● 50.000 ya: Neanderthals consumed cooked barley (Henry et al 2011)
● 32,600 ya: thermal pretreatment and grinding of oat seeds (Italy) (Lippi et al 2015)
● 10.000 ya: gradual start of agricultrure
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Avena sativa history
10,000 y ago: domestication of wheat (einkorn, emmer), barley and pulses as ‘crops’ in Fertile Crescent; oat was a weed
Move of these crops with farmers to Asia and Europe
5000 y ago: Domestication of naked oat in East Asia (China)
4000 y ago: Domestication of hulled oat in NW-Europe
Hulled oat grows best in cool, moist, maritime climates
2000 y ago: Hexaploid oat (Avena sativa) is a major crop in Europe
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Oat, current status
1850: Selections of spring and winter oat landraces
1960: Decline
2000: Increased attention (but no increase in cultivation): health issues
Cultivation area NL 2000: 2404 ha 2014: 1751 ha
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The grain
Olie, vetzuren
Hull
Bran
Endosperm
Germ
‘whole grain’: ’Bran + Endosperm + Germ
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Regain of interest: Oat brings health
Field Feed Food
Total health package
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Field Advantages Robust and sustainable
● Low N need (~ equal yields on sand and clay)
● Low sensitivity to diseases ● Fits well in several crop rotations;
valuable breaker crop ● Positive effects on soil health
(combatting nematodes) ● Stimulation of mycophage nematodes
(control of pathogenic root fungi; may reduce use of soil fungicides)
● Performs well in organic agriculture
Challenge Yield and profit
Experimental yields
2009: 7.9 mt
2010: 8.2 mt
2011: 7.8 mt
2012: 9.7 mt
2013: 8.0 mt
2014: 8.2 mt
2015: 7.3 mt
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Feed
Advantages Promoting intestinal health
Increasing immunity (reduction of antibiotics)
Rich in energy
Keeps animals quiet (satiety)
Weight control
Challenge Competition with other cereals
(maize, wheat) and soy
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Context – Health care costs
Price-increases of health care costs (6%/y)
● Health care budget in NL: ~100 B€/year Price-increases of medicines (€/$) (some examples)
● Daraprim (antidepressivum): 1,- 13.50 750.- (1 capsule)
● Parnate (antidepressivum): 110.- 1,500,- (per month)
● Lemtrada (leukemia) multiple sclerosis): x 40
● Cycloserine (tuberculose): 500,- 10,800.- 1,050 (30 capsules)
Are all medicins necessary and healthy? ● Paroxetine (antidepressivum) is not effective but gives only strong and
harmful side-effects (including suicide) and is suspect (still: 600.000 users in NL over 14 years)
● Where does quackery start?
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Context - Pharma
Strong interconnections: Pharma Health Insurance Comp Hospitals Government
Strong lobby: ● Pharma EU
How to reduce health care costs?
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Context - Reducing Health Care Costs
Much more focus on prevention: Role of Wageningen UR Promotion of healthy food (and life style) as natural
medicines, e.g. whole-grain (bran containing) foods (Fardet 2010; Huang et al 2015; Wu et al 2015)
But:
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Context - Our Food World today (the illusion of choice)
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bran (outer layer of the grain)
vital wheat gluten
germs; flour fractions
native and modified starch
grain alcohol bioethanol
crystalline polyols liquid polyols glucose syrups
maltodextrins
starch milk
Context: Economics of wheat (and corn): starch
‘whole grain’?
milling and separation; sieving; mixing
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Playing field for prevention
Help!
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Food: nutritious and healthy
Starch Proteins Lipids Phenolics Fibre Vitamins Minerals
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Human health: what are the issues? Chronic diseases:
● Cardiovascular diseases
● Diabetes
● Obesity
● Cancer
● Respiratory diseases
● Immune-related diseases
● Allergies
● Coeliac disease
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Easy to prevent
Avoidance of tobacco Healthy diet Regular physical activity
Oats can contribute
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Starch
Total starch: 60%
Unique small particle size
Small amylose chain length
Low solubility
Slow and complete digestibility
Low glycaemic index also due to high soluble fibre content
Helps in diabetes and obesitas
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Proteins
Total protein : 15-20% (highest among cereals)
Globulins (80%), albumins, avenins
Digestibility: very high
Rich in essential amino acids ● Only lysine and threonine are 20% below
the FAO standard
● Lysine is relatively high as compared to other cereals
Fit in Gluten Free Diet
WHO: equal quality to meat, milk, egg protein
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Lipids Total lipid content: 7% average (5.6 - 8.2%),
some (naked oat) varieties: 15%
Unique in cereal endosperm
Unsaturated fatty acids: ~80% %
● (C14:0) 2 (myristic acid)
● (C16:0) 18 (palmitic acid)
● (C18:0) 2 (stearic acid)
● (C18:1) 35 (oleic acid)
● (C18:2) 40 (linoleic acid)
● (C18:3) 2 (linolenic acid)
● (C20:1) 1 (eicosenoic acid)
Lipids may reduce sensory quality (heat processing required)
Reducing risk of heart and vascular diseases
Skin care
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Phenolics
Avenanthramides are unique to oats
● Taken up into the blood stream
● Strong anti-oxidant activity
● Prophylactic against arteriosclerosis, cardiovascular diseases, certain cancers
● May reduce inflammation (applied as anti-allergic antihistamine drug)
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Dietary fibres
Gut
Multiplex detection(IL, IG’s)
Flow sortingGC/MS
(metabolite volatiles)
MetagenomicsMetabolomics(body fluids)
Proteomics
‘Non-healthy’ Immune-system
‘Non-healthy’ Gut
Microflora
‘Healthy’Immune-system
‘Healthy’ Gut
Microflora
Food components (e.g. ß-glucans)
Immune biomarkers(e.g in bodyfluids)
Metabolic, genetic & ecophysiological
biomarkers
Proteomics(gut
permeability)
Physiological biomarkers
Role of beta-glucans in
intestinal health:
* Direct effect on immune system
* Indirect effects through gut microflora
• Maintenance of health status • Improving health in chronic diseases
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Fibres: oat beta glucan
Total fibre ~8% of which ● 58% soluble fibre (mainly beta-glucans)
Formation of highly viscous gums
Retarding stomach emptying ● Improving digestion
● Decreasing postprandial glucose responses
May prolong satiety ● Decrease insulin secretion
● Keep cholecystokinin (CCK) level elevated
Binding cholesterol in intestine ● Reducing LDL-C in blood
● Official FDA and EFSA health claims
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Cholesterol
Many cholesterol-lowering medicines have negative side effects
Oat beta-glucans have cholesterol-lowering and beneficial effects
‘The more oats, the greater the effect’ (max effect at 3-4 g beta-glucans per day)
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Official EFSA health claims applicable to oats
Beta-glucans [3g/day] contribute to the maintenance of normal blood cholesterol levels (EU 432/2012)
Consumption of beta- glucans from oats or barley as part of a meal [4g/30gCarb] contributes to the reduction of the blood glucose rise after that meal (EU 432/2012)
Oat grain fibre contributes to an increase in faecal bulk (EU
432/2012)
Reducing consumption of saturated fat contributes to the maintenance of normal blood cholesterol levels (EU 432/2012)
Oat beta-glucan [3g/day] has been shown to actively lower/reduce blood cholesterol. High cholesterol is a risk factor in the development of coronary heart disease (EU 1160/2011).
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Patent claims related to beta-glucan
Promoting cardiovascular health
Lowering cholesterol / treatment of hypercholesterolemia; prevention of hyperlipidaemia
Treatment of diabetes
Treatment of obesity / weight management
Promoting gastrointestinal health
Use as vaccine or immunostimulant
The beta-glucan patent landscape
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Authorized USA health claims that oat products may utilize
Oat soluble fibre and the reduced risk of coronary heart disease
Whole-grain claims based on authoritative statements
● On risk of heart disease and certain cancers
Potential claim evidence for
● Oats and diabetes risk reduction and diabetes management
● Oats and satiety and weight loss effects
● Whole grains and weight management
● Oats and blood pressure effects
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Volkoren: Haver in de schijf van vijf
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Oats and coeliac disease (CD) (gluten intolerance)
Chronic inflammation of the small intestine
● Increased 4x during the last 50 years (current prevalence: 0.5-2%)
● Genetic predisposition (HLA-DQ2/8)
● Gluten (seed storage proteins) from wheat, rye and barley
Major symptoms of CD in children Chronic bowel ache and diarrhoea Growth retardation
Major symptoms of CD in adults Chronic fatigue, headache, bowel complaints Reduced fertility; miscarriage Dermatitis herpetiformis Osteoporosis Deafness Neuropathy Intestinal cancer (lymphoma)
Strict lifelong gluten free diet
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Gluten digestion incomplete: Proline residues
Healthy small intestine Inflamed small intestine (flat mucosa)
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Oats and Coeliac disease (CD)
• Oat is safe to >99% of people with CD (Pulido et al., 2009 [systematic review])
• Consumption of oats stimulates digestion in people with CD (Kaukinen et al., 2013; Gatti et al., 2013): “the more and the longer, the better”
• Intact coeliac-immunogenic gluten peptides of wheat, barley and rye are absent from oat avenins (Londono et al., 2014)
• 100 g/day oats consumption: no intestinal damage oats can safely be included in GFD (Hardy et al., 2015) [recent Australian position]
• In patients with recovered intestine, daily consumption of unlimited amounts of oats is safe (La Vieille et al 2015) [recent Canadian position]
T-cell stimulation (Koning et al., 2005)
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Oats and coeliac disease
EC Regulation 828/2014, based on EC Regulation 41/2009:
Art. 7. Most people with intolerance to gluten can include oats in their diet without
adverse effect on their health. This is an issue of ongoing study and investigation by the
scientific community. However, a major concern is the contamination of oats with wheat,
rye or barley that can occur during grain harvesting, transport, storage and processing.
Therefore, the risk of gluten contamination in products containing oats should be taken
into consideration with regard to the relevant information provided on those food
products by food business operators.
B. Additional requirements for food containing oats Oats contained in a food
presented as gluten-free or very low gluten must have been specially produced, prepared
and/or processed in a way to avoid contamination by wheat, rye, barley, or their
crossbred varieties and the gluten content of such oats cannot exceed 20 mg/kg.
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Oats and gluten-free
EC Regulation 828/2014: allows to label and to sell oats as ‘gluten-free’ provided a gluten contamination below 20 ppm
In The Nederlands we established The Dutch Oat Chain (De Nederlandse Haverketen)
Worldwide increased interest in ‘gluten-free’
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The Dutch Oat Chain
Started in 2006 in the framework of the CDC
Partnership
● Seed company contract with oat growers
● Oat breeding company
● Gluten-free miller
● Breakfast cereal company (with gluten-free ‘daughter’ company)
● Gluten-free bakery
● Snacks and shakes producer
● (Gluten-free) microbrewer
● Wageningen UR
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Strict rules for gluten free oat cultivation
● Farmer is certified for cultivation of cereals
● No use of organic manure allowed
● No wheat, rye or barley has been grown on the parcel in 8 preceding years
● Registration of the oat cultivation (location, variety, area [ha], yield, delivery)
● Cultivation is at least 3x inspected on occurrence of wheat, barley, rye seedlings
● Oat variety is in agreement with the customer
● Sowing-seed is guaranteed free from contamination and is certified as such
● Oat cultivation area is sufficiently separated (>75m)
● Machines for sowing and harvesting are carefully cleaned
● Delivered products to customer are fully traceable
● Registration of complaints on the product – measures to be taken for improvement
● Production of oat-based foods is only allowed in GF-certified companies
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GF Oat Products on the NL market since 2011 Some examples
Batter-based oat bread: Mam’s Havermikske (FreeOf)
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Kuit beer (traditional Dutch beer style with 50% malted oats)
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Conclusions on Oats
Robust, complete, versatile, healthy
Fits well in a gluten-free diet
May significantly contribute to reduction of health care costs
Challenge for innovations in gluten free and general products and recipes
Dutch gluten-free oats are increasingly appreciated by (inter)national food companies
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Thanks
Celiac Disease Consortium (2004-2013)
● Frits Koning
PRI – Wageningen UR
● Hetty van den Broeck Jan Cordewener Twan America Ingrid van der Meer Jan Schaart Elma Salentijn Diana Londono Aurelie Jouanin Ed Hendrix René Smulders
Micro-brewery Witte Klavervier
● Freek Ruis
EU-TraFooN
● Susanne Braun; Javier Casado
Refs:
Gilissen LJWJ, Van der Meer IM, Smulders MJM (2014) Reducing the incidence of allergy and intolerance to cereals. Journal of Cereal Science 59: 337-353
Londono DM (2014) Laying the foundations for dough-based oat bread. Thesis, Wageningen
Gilissen LJWJ, Van der Meer IM, Smulders MJM (2016) Strategies to reduce or prevent wheat coeliac-immunogenicity and wheat sensitivity through food. Proceedings of the 29th PWG Meeting, Tulln, pp 41 -54