Perhaps dietary guidelines should stress fresh, frozen, and dried fruit—rather than canned.
Is Canned Fruit as Healthy?
Food cans used to be soldered with lead compounds—so much so that people living off of canned food may have died from lead poisoning. Thankfully, this is no longer a problem in the United States. Lead contamination was actually one of the first priorities of the FDA back in 1906, before it was even called the FDA. It’s great that newspapers now have online archives going back a century, so we can read about landmark historical events like “FDA Proposes Lead-Soldered Cans Be Banned” way back yonder in 1993, going into effect in 1995. Evidently, it was complicated because lead solder was grandfathered in as a prior-sanctioned substance.
Now that the lead is gone, are canned foods healthy? It primarily depends on what’s in the can. If it’s SPAM-dandy, I’d probably pass. Let’s give canned food the benefit of the doubt, though. What about canned fruit?
We know fruits and vegetables in general may help protect us from dying from cardiovascular disease. And when it comes to preventing strokes, fruit may be even more protective. But whether food processing affects this association was unknown. This study found that unprocessed produce (mostly apples and oranges) appeared superior to processed produce. But that was mainly orange and apple juice. No surprise whole fruit is better than fruit juice. What about whole fruit, but just in a can? Dietary guidelines encourage all fruit—fresh, frozen, and canned. But, few studies have examined the health benefits of canned fruit, until now. Canned fruit did not seem to enable people to live longer. In fact, moving from fresh or dried fruit to canned fruit might even shorten one’s life. So, maybe dietary guidelines should stress fresh, frozen, and dried rather than canned.
Why the difference? There’s no more lead, but there is that plastics chemical—BPA—that is used in the lining of most cans, which can leach into the food, and might counterbalance some of the fruit benefits. Recently, blood levels of this chemical were associated with thickening of the linings of the arteries going up to the brains of young adults, for example. Canned fruit is often packed in syrup, as well, with all that added sugar, and the canning process may diminish some nutrients—potentially wiping out 20% to 40% of the phenolic phytonutrients, and about half of the vitamin C.
Maybe one of the reasons citrus appears particularly protective is the vitamin C. It appears the more vitamin C in our diet, the lower our risk of stroke; and the more vitamin C we have in our bloodstream, the lower our risk of stroke. But how did the vitamin C get in their bloodstream? They must have eaten a lot of healthy foods, like citrus, tropical fruits, broccoli, bell peppers.
Therefore, the observed effect of vitamin C on stroke reduction may simply be a proxy for specific healthy foods that lower stroke risk. How could we tell? Give people just vitamin C pills instead, and see if they work. They don’t.
Citrus fruits have all sorts of other compounds associated with lower stroke risk. The whole is greater than the sum of its parts. You can’t capture Mother Nature in a pill. It’s like the apocryphal beta-carotene story. Dozens of studies showed that people who ate more beta-carotene-rich foods, like greens and sweet potatoes, and who had more beta-carotene circulating in their system, had lower cancer risk. But how much money can you make selling carrots? So, they tried giving beta carotene pills to people, and not only didn’t they work; they may have even caused more cancer.
So, I assumed this National Cancer Institute researcher would conclude the obvious: produce, not pills. But no; maybe we should have tried lower dose pills, or maybe alpha-carotene pills, or pills with other phytochemicals, or multiple combinations. After all, it is likely that neither the public nor the scientific community will be satisfied with recommendations concerned solely with mere foods.
To see any graphs, charts, graphics, images, and quotes to which Dr. Greger may be referring, watch the above video. This is just an approximation of the audio contributed by Katie Schloer.
Please consider volunteering to help out on the site.
- L M Oude Griep, W M Verschuren, D Kromhout, M C Ocké, J M Geleijnse. Raw and processed fruit and vegetable consumption and 10-year stroke incidence in a population-based cohort study in the Netherlands. Eur J Clin Nutr. 2011 Jul;65(7):791-9.
- A Mizrahi, P Knekt, J Montonen, M A Laaksonen, M Heliövaara, R Järvinen. Plant foods and the risk of cerebrovascular diseases: a potential protection of fruit consumption. Br J Nutr. 2009 Oct;102(7):1075-83.
- M A Martínez-González, R M Lamuela-Raventos. The unparalleled benefits of fruit. Br J Nutr. 2009 Oct;102(7):947-8.
- G C Chen, D B Lu, Z Pang, Q F Liu. Vitamin C intake, circulating vitamin C and risk of stroke: a meta-analysis of prospective studies. J Am Heart Assoc. 2013 Nov 27;2(6):e000329.
- E T Aasheim, S J Sharp, P N Appleby, M J Shipley, M A Lentjes, K T Khaw, E Brunner, T J Key, N J Wareham. Tinned fruit consumption and mortality in three prospective cohorts. PLoS One. 2015 Feb 25;10(2):e0117796.
- P M Bolger, N J Yess, E L Gunderson, T C Troxell, C D Carrington. Identification and reduction of sources of dietary lead in the United States. Food Addit Contam. 1996 Jan;13(1):53-60.
- U Aasebø, K G Kjaer. Lead poisoning as possible cause of deaths at the Swedish House at Kapp Thordsen, Spitsbergen, winter 1872-3. BMJ. 2009 Dec 4;339:b5038.
- D Albanes. Beta-carotene and lung cancer: a case study. Am J Clin Nutr. 1999 Jun;69(6):1345S-1350S.
- DEPARTMENT OF HEALTH AND HUMAN SERVICES Food and Drug Administration 21 CFR Part 189 [Docket Nos. 82P–0371 and 91N–0165] Lead-Soldered Food Cans.
- M Kashtock. Lead in Food The Neo-Classical Contaminant. Intentional and Unintentional Contaminants in Food and Feed, Chapter 15, pp 229–253.
- X Wang. Y Ouyang, J Liu, M Zhu, G Zhao, W Bao, F B Hu. Fruit and vegetable consumption and mortality from all causes, cardiovascular disease, and cancer: systematic review and dose-response meta-analysis of prospective cohort studies. BMJ. 2014 Jul 29;349:g4490.
- J C Rickman, D M Barrett, C M Bruhn. Nutritional comparison of fresh, frozen and canned fruits and vegetables. Part 1. Vitamins C and B and phenolic compounds. J Sci Food Agric 87:930–944 (2007).
- C Y Lin, F Y Shen, G W Lian, K L Chien, F C Sung, P C Chen, T C Su. Association between levels of serum bisphenol A, a potentially harmful chemical in plastic containers, and carotid artery intima-media thickness in adolescents and young adults. Atherosclerosis. 2015 Aug;241(2):657-63.
Image thanks to 445693 via Pixabay
Food cans used to be soldered with lead compounds—so much so that people living off of canned food may have died from lead poisoning. Thankfully, this is no longer a problem in the United States. Lead contamination was actually one of the first priorities of the FDA back in 1906, before it was even called the FDA. It’s great that newspapers now have online archives going back a century, so we can read about landmark historical events like “FDA Proposes Lead-Soldered Cans Be Banned” way back yonder in 1993, going into effect in 1995. Evidently, it was complicated because lead solder was grandfathered in as a prior-sanctioned substance.
Now that the lead is gone, are canned foods healthy? It primarily depends on what’s in the can. If it’s SPAM-dandy, I’d probably pass. Let’s give canned food the benefit of the doubt, though. What about canned fruit?
We know fruits and vegetables in general may help protect us from dying from cardiovascular disease. And when it comes to preventing strokes, fruit may be even more protective. But whether food processing affects this association was unknown. This study found that unprocessed produce (mostly apples and oranges) appeared superior to processed produce. But that was mainly orange and apple juice. No surprise whole fruit is better than fruit juice. What about whole fruit, but just in a can? Dietary guidelines encourage all fruit—fresh, frozen, and canned. But, few studies have examined the health benefits of canned fruit, until now. Canned fruit did not seem to enable people to live longer. In fact, moving from fresh or dried fruit to canned fruit might even shorten one’s life. So, maybe dietary guidelines should stress fresh, frozen, and dried rather than canned.
Why the difference? There’s no more lead, but there is that plastics chemical—BPA—that is used in the lining of most cans, which can leach into the food, and might counterbalance some of the fruit benefits. Recently, blood levels of this chemical were associated with thickening of the linings of the arteries going up to the brains of young adults, for example. Canned fruit is often packed in syrup, as well, with all that added sugar, and the canning process may diminish some nutrients—potentially wiping out 20% to 40% of the phenolic phytonutrients, and about half of the vitamin C.
Maybe one of the reasons citrus appears particularly protective is the vitamin C. It appears the more vitamin C in our diet, the lower our risk of stroke; and the more vitamin C we have in our bloodstream, the lower our risk of stroke. But how did the vitamin C get in their bloodstream? They must have eaten a lot of healthy foods, like citrus, tropical fruits, broccoli, bell peppers.
Therefore, the observed effect of vitamin C on stroke reduction may simply be a proxy for specific healthy foods that lower stroke risk. How could we tell? Give people just vitamin C pills instead, and see if they work. They don’t.
Citrus fruits have all sorts of other compounds associated with lower stroke risk. The whole is greater than the sum of its parts. You can’t capture Mother Nature in a pill. It’s like the apocryphal beta-carotene story. Dozens of studies showed that people who ate more beta-carotene-rich foods, like greens and sweet potatoes, and who had more beta-carotene circulating in their system, had lower cancer risk. But how much money can you make selling carrots? So, they tried giving beta carotene pills to people, and not only didn’t they work; they may have even caused more cancer.
So, I assumed this National Cancer Institute researcher would conclude the obvious: produce, not pills. But no; maybe we should have tried lower dose pills, or maybe alpha-carotene pills, or pills with other phytochemicals, or multiple combinations. After all, it is likely that neither the public nor the scientific community will be satisfied with recommendations concerned solely with mere foods.
To see any graphs, charts, graphics, images, and quotes to which Dr. Greger may be referring, watch the above video. This is just an approximation of the audio contributed by Katie Schloer.
Please consider volunteering to help out on the site.
- L M Oude Griep, W M Verschuren, D Kromhout, M C Ocké, J M Geleijnse. Raw and processed fruit and vegetable consumption and 10-year stroke incidence in a population-based cohort study in the Netherlands. Eur J Clin Nutr. 2011 Jul;65(7):791-9.
- A Mizrahi, P Knekt, J Montonen, M A Laaksonen, M Heliövaara, R Järvinen. Plant foods and the risk of cerebrovascular diseases: a potential protection of fruit consumption. Br J Nutr. 2009 Oct;102(7):1075-83.
- M A Martínez-González, R M Lamuela-Raventos. The unparalleled benefits of fruit. Br J Nutr. 2009 Oct;102(7):947-8.
- G C Chen, D B Lu, Z Pang, Q F Liu. Vitamin C intake, circulating vitamin C and risk of stroke: a meta-analysis of prospective studies. J Am Heart Assoc. 2013 Nov 27;2(6):e000329.
- E T Aasheim, S J Sharp, P N Appleby, M J Shipley, M A Lentjes, K T Khaw, E Brunner, T J Key, N J Wareham. Tinned fruit consumption and mortality in three prospective cohorts. PLoS One. 2015 Feb 25;10(2):e0117796.
- P M Bolger, N J Yess, E L Gunderson, T C Troxell, C D Carrington. Identification and reduction of sources of dietary lead in the United States. Food Addit Contam. 1996 Jan;13(1):53-60.
- U Aasebø, K G Kjaer. Lead poisoning as possible cause of deaths at the Swedish House at Kapp Thordsen, Spitsbergen, winter 1872-3. BMJ. 2009 Dec 4;339:b5038.
- D Albanes. Beta-carotene and lung cancer: a case study. Am J Clin Nutr. 1999 Jun;69(6):1345S-1350S.
- DEPARTMENT OF HEALTH AND HUMAN SERVICES Food and Drug Administration 21 CFR Part 189 [Docket Nos. 82P–0371 and 91N–0165] Lead-Soldered Food Cans.
- M Kashtock. Lead in Food The Neo-Classical Contaminant. Intentional and Unintentional Contaminants in Food and Feed, Chapter 15, pp 229–253.
- X Wang. Y Ouyang, J Liu, M Zhu, G Zhao, W Bao, F B Hu. Fruit and vegetable consumption and mortality from all causes, cardiovascular disease, and cancer: systematic review and dose-response meta-analysis of prospective cohort studies. BMJ. 2014 Jul 29;349:g4490.
- J C Rickman, D M Barrett, C M Bruhn. Nutritional comparison of fresh, frozen and canned fruits and vegetables. Part 1. Vitamins C and B and phenolic compounds. J Sci Food Agric 87:930–944 (2007).
- C Y Lin, F Y Shen, G W Lian, K L Chien, F C Sung, P C Chen, T C Su. Association between levels of serum bisphenol A, a potentially harmful chemical in plastic containers, and carotid artery intima-media thickness in adolescents and young adults. Atherosclerosis. 2015 Aug;241(2):657-63.
Image thanks to 445693 via Pixabay
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Is Canned Fruit as Healthy?
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Content URLDoctor's Note
Check out my other videos on the can-lining chemical bisphenol A, including:
- How to Avoid the Obesity-Related Plastic Chemical BPA
- Are the BPA-Free Alternatives Safe?
- Why BPA Hasn’t Been Banned
- BPA Plastics and Male Sexual Dysfunction
If fresh fruit really that healthy? See:
- If Fructose Is Bad, What About Fruit?
- Gout Treatment with a Cherry on Top
- Anti-Inflammatory Life Is a Bowl of Cherries
- Which Fruits Fight Cancer Better?
Is it possible to get too much of a good thing? See How Much Fruit Is Too Much?.
Now that there’s no more lead in the cans, are there any other ways we’re exposed to the toxic heavy metal? I did a whole series on lead, which you can watch. See also:
- Get the Lead Out
- Heavy Metals in Protein Powder Supplements
- Filled Full of Lead
- California Children Are Contaminated
- Lead Contamination of Tea
I close with yet another screed against reductionism. For more on that, see my videos Why Is Nutrition So Commercialized? and Reductionism and the Deficiency Mentality.
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