Every year when I go in for my annual primary care visit –
they give me the 2-item test for fruit and vegetable consumption. It asks for an estimate of how many servings
of fruit and vegetables are consumed every day. I can’t recall the breakpoints
my health plan uses but the scale runs from zero servings per day up to ≥ 5. If you research these screenings, some
studies will use half measures (like 2.5 servings if consumption varies between
2 or 3). Other studies will get very
specific about what constitutes a serving.
That can vary from “one small apple” to “one cup of apples” to “a
baseball sized portion.”. My goal with this
post is to illustrate how you can pass this screen by eating one complicated
but easy to make salad a day. I will
also illustrate how to record recipes easily using a system invented by an
engineer.
I have to add the usual disclaimers that I am not advising
you to make and eat this salad like I do – only showing what is possible for
educational purposes. If you are a vegetarian for example, I expect that you
would easily exceed the upper end of the scale.
There are two additional advantages to the salad I eat almost every day
– first it is designed to be palatable for people like me who generally do not
like the taste of vegetables. Second, it
minimizes spoilage. The only ingredient susceptible is tri-color slaw and
carrots and they are usually consumed by the expiration date on the bag. The other ingredients are either frozen
(berries) or have a long shelf life (apples).
I stopped trying to use lettuce of any type because it often
spoiled before the expiration date. The
paternal side of my family were cabbage (and potato) eaters from central
Europe. It took me a while to figure out
why – but then it dawned on me – they could preserve barrels of cabbage as
sauerkraut and not need any refrigeration.
Cabbage also has endogenous antioxidants and that is also probably why
it lasts longer than lettuce. Sauerkraut also fundamentally changes the taste of cabbage, leading me to think that many of those relatives may have had the
same aversion to vegetables that I do. As
an example, I remember my father eating overcooked boiled potatoes as his main vegetable
staple while the rest of us were supposed to be eating a broader selection.
There is a taste receptor specific and non-specific genetic
component to taste and it has been studied for both vegetables and food-liking
or food fussiness. Cabbage makes
the list in several categories.
|
Gene / variant |
What it detects |
Functional effect |
Consequence for vegetables / diet |
|
TAS2R38 — PAV ("taster") |
Glucosinolates/isothiocyanates in Brassica (broccoli, sprouts, cabbage,
kale); PROP/PTC |
High bitter sensitivity; more PAV mRNA expressed in taste cells
correlates with stronger perceived bitterness |
Greater bitterness → vegetable avoidance; may shift toward
sweeter/fattier foods; "tasters" decreased vegetable intake under
minimal dietary counseling |
|
TAS2R38 — AVI ("non-taster") |
Same compounds |
Low/absent bitter perception |
Less aversion; largest increases in vegetable intake with intervention |
|
TAS2R38 — heterozygote (PAV/AVI) |
Same compounds |
Intermediate sensitivity, widest perceptual range |
Variable acceptance; intermediate vegetable intake response |
|
TAS2R16 |
Bitter β-glucosides (broad glycoside ligands) |
Two-faced binding pocket giving high specificity across diverse
glycosides |
Modulates perception of bitter plant glycosides, contributing to
bitter-food preference |
|
TAS2R19 |
Bitter glycosides (e.g., in grapefruit, other plant foods) |
Clusters genetically with bitter-food liking traits |
Associated with liking of bitter vegetables/foods |
|
Multiple TAS2R loci (GWAS) |
Various bitter compounds |
Polygenic influence on bitter-taste pathways |
Collectively shape bitter-food preferences and metabolic/sensory
pathways |
|
Food-fussiness / food-liking heritability |
Not receptor-specific |
~50% heritable; genetic correlation ~−0.65 between fussiness and
vegetable liking |
Some children genetically predisposed to reject vegetables independent
of a single gene |
|
1: A Review of the Associations
Between Single Nucleotide Polymorphisms in Taste Receptors, Eating Behaviors,
and Health. Critical Reviews in Food Science and Nutrition. 2018. https://pubmed.ncbi.nlm.nih.gov/27247080 2: Bitter Taste of Brassica
Vegetables: The Role of Genetic Factors, Receptors, Isothiocyanates,
Glucosinolates, and Flavor Context. Critical Reviews in Food Science and
Nutrition. 2017. https://pubmed.ncbi.nlm.nih.gov/28718657 3: Human Bitter Perception Correlates With
Bitter Receptor Messenger RNA Expression in Taste Cells. The American Journal of Clinical
Nutrition. 2013. https://pubmed.ncbi.nlm.nih.gov/24025627 4: TAS2R38 Predisposition to
Bitter Taste Associated With Differential Changes in Vegetable Intake in
Response to a Community-Based Dietary Intervention. G3. 2018. https://pubmed.ncbi.nlm.nih.gov/29686110 5: A Review of the Associations
Between Single Nucleotide Polymorphisms in Taste Receptors, Eating Behaviors,
and Health. Critical Reviews in Food Science and Nutrition. 2018.
https://pubmed.ncbi.nlm.nih.gov/27247080 6: Human Bitter Perception
Correlates With Bitter Receptor Messenger RNA Expression in Taste Cells. The
American Journal of Clinical Nutrition. 2013.
https://pubmed.ncbi.nlm.nih.gov/24025627 7: TAS2R38 Predisposition to
Bitter Taste Associated With Differential Changes in Vegetable Intake in
Response to a Community-Based Dietary Intervention. G3. 2018. https://pubmed.ncbi.nlm.nih.gov/29686110 8: Human Bitter Perception
Correlates With Bitter Receptor Messenger RNA Expression in Taste Cells. The
American Journal of Clinical Nutrition. 2013.
https://pubmed.ncbi.nlm.nih.gov/24025627 9: TAS2R38 Predisposition to
Bitter Taste Associated With Differential Changes in Vegetable Intake in
Response to a Community-Based Dietary Intervention. G3. 2018. https://pubmed.ncbi.nlm.nih.gov/29686110 10: The Bitter Taste Receptor TAS2R16 Achieves High Specificity and
Accommodates Diverse Glycoside Ligands by using a Two-faced Binding Pocket.
Scientific Reports. 2017. https://doi.org/10.1038/s41598-017-07256-y 11: Genome-Wide Association Analyses of Bitter Food Preferences Link
Genetic Loci to Sensory and Metabolic Pathways. The Journal of Nutrition.
2026. https://pubmed.ncbi.nlm.nih.gov/42632617 12: A biologically informed framework for instrument selection in
dietary Mendelian randomization using chemosensory genetics. BMC Medicine.
2026. https://doi.org/10.1186/s12916-026-04966-x 13: Genome-Wide Association Analyses of Bitter Food Preferences Link
Genetic Loci to Sensory and Metabolic Pathways. The Journal of Nutrition.
2026. https://pubmed.ncbi.nlm.nih.gov/42632617 14: A biologically informed
framework for instrument selection in dietary Mendelian randomization using
chemosensory genetics. BMC Medicine. 2026.
https://doi.org/10.1186/s12916-026-04966-x 15: Common Genetic Architecture
Underlying Young Children's Food Fussiness and Liking for Vegetables and
Fruit. The American Journal of Clinical Nutrition. 2016.
https://pubmed.ncbi.nlm.nih.gov/26864359 16: Large-scale GWAS of food
liking reveals genetic determinants and genetic correlations with distinct
neurophysiological traits. Nature Communications. 2022.
https://doi.org/10.1038/s41467-022-30187-w
|
|||
The implications of the above table seem fairly clear. If you are one of these folks who prefers fats
and sugars to vegetables it seems logical that disguising that taste would make
these foods more palatable. Salt, pepper,
sugar and other condiments are commonly used as well as butter. There are numerous forms of coleslaw made with this shredded slaw mix that add fat, vinegar, and sweetener. Just a few years ago, I had my first salad
with blueberries and that was an eye opener.
I typically use salad dressing to disguise the vegetable taste, but
blueberries worked very well. That is
one of the driving forces for the salad I will reveal below.
The other driving force is also genetics. Several years ago, I learned that I have a
risk genotype for pancreatic cancer as well as being in the 100th
percentile for polygenic risk for amyotrophic lateral sclerosis (ALS). I would like to try to avoid both of those
illnesses if possible. How and whether
or not either of those genotypes get expressed is still a research question. The answer can only be approximated by epidemiological
studies and the results are conflicting.
In terms of exercise, it probably reduces cancer risk but the ALS risk
is an open question. Contact sports and
in some cases high exertion athletics can increase risk. In other cases, non-contact exercise at any
level does not seem to have an impact. Dietary
effects on cancer and cardiovascular disease are more well known and the source of
recommendations for non-processed fruits and vegetables. In terms of ALS – higher premorbid intake of
fat, trans fat, and cholesterol were higher in a group who developed ALS. Fruit
and vegetable intake reduced the risk by 34%.
In a Mendelian randomization study (genotype risk concentration) oily fish, fresh
fruit, coffee intake reduced the risk. There
is no definitive prevention path suggested by the studies done so far only the
recommendation for larger intervention-based studies. With current genotyping methods those studies
can be done on a pool of subjects with concentrated ALS risk.
At any rate, general dietary guidelines suggest that fruits
and vegetables are a critical component of the diet with certain other common
components (high added sugar, high saturated fat, trans fat, cholesterol, alcohol)
- red flagged. The dietary landscape
has been more confused than ever over the past 2 years based on political misinformation.
Against that backdrop I present my personal solution (again not a
recommendation to you or medical advice) that allows me to both pass my primary
care physician’s fruit and vegetable screening and reassure myself that I can
ingest a palatable meal that is probably good for my health. The salad is also designed to be cost
effective since one of the main concerns with fresh produce is how long it will
last before it is discarded.
The blueberry salad that started all of this was mixed salad
greens, blueberries, and a vinaigrette dressing. I have not had much luck with mixed greens or
even lettuce in my refrigerator. They generally
deteriorate well before the best by date and rapidly discolor. I decided to substitute mixed slaw (red cabbage,
green cabbage, carrots). Apples last
longer and I decided to add that to the mix. The
recipe is presented in graphic form below.
As you can see this is a combination of 3 vegetables and 4 fruits for a
total of 7 per day – all in one bowl.
That is my salad that I eat most days of the week. I don't know if there is a gene that allows for eating the exact same food every day - but if it exists I definitely have it. The
cumulative number of fruits and vegetables at the end of the year is impressive
and any spoilage is minimal. A summary
of the possible nutritional benefits is listed in the table below.
|
Ingredient |
Antioxidant capacity |
Flavonoids |
Dietary fiber |
Characteristic phytochemicals |
|
Blackberry |
Very high (among highest cellular antioxidant activity of common
fruits) |
Rich in anthocyanins; flavonols (quercetin) |
High (berries ~5–8 g/cup) |
Anthocyanins, ellagitannins, hydroxycinnamic acids |
|
Raspberry |
Very high; anthocyanin-rich fruits show highest TEAC/FRAP/ORAC |
Anthocyanins; quercetin |
~8.0 g per cup |
Anthocyanins (cyanidin), ellagitannins |
|
Blueberry |
Very high cellular antioxidant activity |
Anthocyanins; notable seasonal variation in flavonoid content |
High (berries) |
Anthocyanins (delphinidin, malvidin, petunidin), chlorogenic acid |
|
Red cabbage |
Highest among cabbages/vegetables; highest TEAC of the vegetables
tested |
Highest cabbage flavonoid content (~108 mg catechin eq/100 g); cyanidin
predominates |
Moderate (cabbage, fermentable) |
Anthocyanins (cyanidin), glucosinolates, kaempferol, quercetin |
|
Yellow/green cabbage |
Lower than red cabbage but still notable (flavonol-rich) |
Kaempferol, quercetin, apigenin predominate (lower total than red) |
Moderate (fermentable) |
Glucosinolates/isothiocyanates, flavonols |
|
Carrot |
Lower than berries/red cabbage |
Low flavonol content |
~2.8 g/100 g (skin); 4.8 g/cup cooked |
Carotenoids (β-carotene), galactose-rich pectin |
|
Apple (with skin) |
Lower (hydroxycinnamate-rich fruits lowest antioxidant activity), but a
major dietary phenolic contributor |
Lowest flavonol content among fruits tested (~460 mg/kg dry); quercetin
concentrated in skin |
~2.4 g/100 g; 4.4 g per medium apple |
Chlorogenic acid, quercetin glycosides, procyanidins |
|
1: Cellular Antioxidant Activity
of Common Fruits. Journal of Agricultural and Food Chemistry. 2008. https://pubmed.ncbi.nlm.nih.gov/187594502: 2: Synergistic, Additive, and
Antagonistic Effects of Food Mixtures on Total Antioxidant Capacities.
Journal of Agricultural and Food Chemistry. 2011. https://pubmed.ncbi.nlm.nih.gov/21222468
3: Flavonoid Content of U.S.
Fruits, Vegetables, and Nuts. Journal of Agricultural and Food Chemistry.
2006. https://pubmed.ncbi.nlm.nih.gov/17177529
4: Flavonoid Content of U.S.
Fruits, Vegetables, and Nuts. Journal of Agricultural and Food Chemistry.
2006. https://pubmed.ncbi.nlm.nih.gov/17177529
5: The Antioxidant Activity of
Regularly Consumed Fruit and Vegetables Reflects Their Phenolic and Vitamin C
Composition. Free Radical Research. 2002. https://pubmed.ncbi.nlm.nih.gov/11999391
6: Chronic Constipation in
Adults. American Family Physician. 2022. https://www.aafp.org/afp/2022/0900/chronic-constipation-adults
7: Cellular Antioxidant Activity
of Common Fruits. Journal of Agricultural and Food Chemistry. 2008. https://pubmed.ncbi.nlm.nih.gov/18759450
8: Flavonoid Content of U.S.
Fruits, Vegetables, and Nuts. Journal of Agricultural and Food Chemistry.
2006. https://pubmed.ncbi.nlm.nih.gov/17177529
9: The Antioxidant Activity of
Regularly Consumed Fruit and Vegetables Reflects Their Phenolic and Vitamin C
Composition. Free Radical Research. 2002. https://pubmed.ncbi.nlm.nih.gov/11999391
10: Antioxidant Properties of Raw and Processed Cabbages. International
Journal of Food Sciences and Nutrition. 2004. https://pubmed.ncbi.nlm.nih.gov/15223595
11: Fibre: The Forgotten Carbohydrate in Sports Nutrition
Recommendations. Sports Medicine. 2025. https://doi.org/10.1007/s40279-024-02167-1
12: The Antioxidant Activity of Regularly Consumed Fruit and Vegetables
Reflects Their Phenolic and Vitamin C Composition. Free Radical Research.
2002. https://pubmed.ncbi.nlm.nih.gov/11999391
13: Antioxidant Properties of Raw and Processed Cabbages. International
Journal of Food Sciences and Nutrition. 2004. https://pubmed.ncbi.nlm.nih.gov/15223595
14: Glucosinolates From Cruciferous Vegetables and Their Potential Role
in Chronic Disease: Investigating the Preclinical and Clinical Evidence.
Frontiers in Pharmacology. 2021. https://pubmed.ncbi.nlm.nih.gov/34764875
15: Chronic Constipation in Adults. American Family Physician. 2022. https://www.aafp.org/afp/2022/0900/chronic-constipation-adults
16: Does Vegetable Colour Matter? A Comparative Assessment of Bioactive
Composition and Biological Properties. Food Chemistry. 2026. https://pubmed.ncbi.nlm.nih.gov/42566904
17: Dichotomous effect of dietary fiber in pediatrics: a narrative
review of the health benefits and tolerance of fiber. European Journal of
Clinical Nutrition. 2024. https://doi.org/10.1038/s41430-024-01429-5
18: The Antioxidant Activity of Regularly Consumed Fruit and Vegetables Reflects Their Phenolic and Vitamin C Composition. Free Radical Research. 2002. https://pubmed.ncbi.nlm.nih.gov/11999391 19: Dichotomous effect of dietary fiber in pediatrics: a narrative
review of the health benefits and tolerance of fiber. European Journal of
Clinical Nutrition. 2024. https://doi.org/10.1038/s41430-024-01429-5
20: Flavonols (Kaempeferol, Quercetin, Myricetin) Contents of Selected
Fruits, Vegetables and Medicinal Plants. Food Chemistry. 2008. https://pubmed.ncbi.nlm.nih.gov/26065748 21: Panche AN, Diwan AD, Chandra SR. Flavonoids: an overview. J Nutr
Sci. 2016 Dec 29;5:e47. doi: 10.1017/jns.2016.41. Erratum in: J Nutr Sci.
2025 Jan 29;14:e11. doi: 10.1017/jns.2024.73. https://pmc.ncbi.nlm.nih.gov/articles/PMC5465813/
Note: In the above table TEAC, FRAP, and ORAC are all antioxidant assays. |
||||
The table illustrates this this salad adds fruit and
vegetable components that are not generally available form other sources. It is
complementary rather than complete nutrition because it lacks protein, several
vitamins (B-6, B-12, D, E), minerals (Ca, I Zn, Fe, Se), fats and omega-3 FFA,
and caloric density. Some of these deficiencies
can be made up by the additional components of the salad (olive oil in vinaigrette,
additional nuts, etc). and additional food groups. This salad is a niche player in the overall
diet – but an important one in supplying necessary antioxidants, fiber, and
phytochemicals that are not available elsewhere. It is designed to avoid processed foods and
food wasting.
George Dawson, MD, DFAPA
Supplementary 1: The
graphic recipe display has two sources.
The first is the engineer Michael Chu's blog "Cooking for
Engineers" who came up with the idea in the first place. The second is the online site Recipe Tables where I was able to convert
my recipe to graphic form. The software named
it Wyman’s Berry Salad based on the name of the frozen berries that I use. Any
brand will do but I found these were the best prepared and do not require any
additional preparation other than defrosting. I typically use the defrost cycle in my microwave for 2-3 minutes depending on portion size.
Supplementary 2: While I am meteing out dietary advice I thought I would also include a place where you can get expert advice including advice that is designed to counter the current misinformation from the US Government.
Dr. Jessica Knurick https://www.jessicaknurick.com/ An extremely articulate doctorate level nutritionist with both written and visual channels. She has not only expert dietary advice that seems rare these days but also very good opinions about professional boundaries like the roles of physicians and dieticians and how our current healthcare system is respecting nether profession.
References:
1: Goutman, S.A.,
Savelieff, M.G., Jang, DG. et al. The amyotrophic lateral sclerosis exposome:
recent advances and future directions. Nat Rev Neurol 19, 617–634 (2023). https://doi.org/10.1038/s41582-023-00867-2
2: Huisman MHB,
Seelen M, van Doormaal PTC, et al. Effect of Presymptomatic Body Mass Index and
Consumption of Fat and Alcohol on Amyotrophic Lateral Sclerosis. JAMA Neurol.
2015;72(10):1155–1162. doi:10.1001/jamaneurol.2015.1584
3: Nieves JW,
Gennings C, Factor-Litvak P, et al. Association Between Dietary Intake and
Function in Amyotrophic Lateral Sclerosis. JAMA Neurol. 2016;73(12):1425–1432.
doi:10.1001/jamaneurol.2016.3401
4: Jing Z, Qi X, Teng
J. Dietary factors and risk for amyotrophic lateral sclerosis: A two sample
mendelian randomization study. Medicine (Baltimore). 2024 Jun
21;103(25):e38473. doi: 10.1097/MD.0000000000038473. PMID: 38905382; PMCID:
PMC11191971.
5: Chapman L,
Cooper-Knock J, Shaw PJ. Physical activity as an exogenous risk factor for
amyotrophic lateral sclerosis: a review of the evidence. Brain. 2023 May
2;146(5):1745-1757. doi: 10.1093/brain/awac470. PMID: 36918362; PMCID:
PMC10151186.
6: Westeneng HJ, van
Veenhuijzen K, van der Spek RA, Peters S, Visser AE, van Rheenen W, Veldink JH,
van den Berg LH. Associations between lifestyle and amyotrophic lateral
sclerosis stratified by C9orf72 genotype: a longitudinal, population-based,
case-control study. Lancet Neurol. 2021 May;20(5):373-384. doi:
10.1016/S1474-4422(21)00042-9. PMID: 33894192.



