**Warning - this is more of a 'staging post' than a fully published post.
The information is incomplete, do not rely on it, thanks. If you've come
here to answer the question 'should I eat Beneforte?' you are in the
wrong place I'm afraid, this post does not answer that question. I also
cannot recommend highly enough Ben Goldacre's book 'Bad Science'**
I
used to look into health claims of all sorts of things with much
greater regularity than I do now (different job, still do a fair bit as
part of 'skeptic activism') but I thought I'd keep my hand in and
'rehearse' some arguments for myself, looking at the claims of Beneforte
broccoli. It's a variant of regular broccoli that is higher in what is
generally thought of as good chemical compound (glucoraphanin) to have
in your broccoli.
Normally I don't publish a blog post
until it's finished and I've pretty much settled on what side of the
evidence I come down on. Exceptions include alternative health
modalities I haven't previously researched and where I'm using the blog
to store info and ideas and seek input from others. For example, even
though it's not unreasonable to assume that iridology is utter bollocks
it's a little unfair to be too dogmatic without looking into it. As it
happens it
is unmitigated bollocks, but it was interesting to
learn what you can and can't tell about someone's health from looking at
the surface of their eyes. And how you can tell from the literature.
So
this post is 'me in the middle of some things about broccoli' and is
more about the strategies and shortcuts I use in finding out about
stuff, rather than actually what I found out. It's entirely possible
that I will disagree with myself. It's quite fun (for me, dunno for you)
to publish a post where I've actually not researched it in much depth,
this is more of a thinking out loud exercise.
Note
that I am not medically trained, not a dietitian and not a specialist in
broccoli - therefore my feelings about broccoli should not affect yours
:)
My first thought was "what do I actually need to know?" My second was "where do I need to look to find it?"
There
are only a few things I can confidently answer without even looking in a
book or at any research. Even if I know something pretty well, if a few
months or more have passed, then my info may be out of date - or I may
have forgotten the details!
If the claims imply that A, whatever A might be (in this case
more glucoraphanin),
are of some benefit to people in some way B then I'm probably hoping to
find a human trial where people got more or better B when they consumed
more A.
I suppose what I really want is a study which shows that
[
taking more Beneforte] leads to [
less cancer, less diabetes, less
other]. What I can fairly easily find are studies that indicate that [
taking more
Beneforte] leads to, or might lead to (not all that many studies done?) [
presence of glucoraphanin
in blood or urine] or [
more good metabolites* in the blood or less bad
metabolites in the blood]
*metabolites are the products of
metabolism. In the case of glucoraphanin it is converted to the 'active'
form, called sulforaphane.
There is a study that suggests eating Beneforte activates
some genes that are protective in preventing prostate cancer, I might want
to give that a look and see what conclusions can be drawn from it.
This information is all very
interesting but of course it doesn't prove that [
taking Beneforte] will improve any particular person's health outcomes.
This
isn't disastrous at all though, and in fact it would be an unreasonable burden to ask for
that proof. Most prescribed drugs are intended to stop people
dying of X or suffering from Y. Both X and Y often take a long time to
show up and it's really expensive to run a trial long enough for
complications of conditions to show up so people use what are called 'proxy markers'.
Eg, a drug for diabetes is ultimately intended to keep blood
glucose levels low enough so that the damage that excess glucose would
do happens much more slowly. Though imperfect it is fairly reasonable to talk about a drug's
effectiveness in terms of its ability to lower glucose levels in terms of a particular measure called the HbA1c (rather
than its ability to stop people dying) because we're
fairly confident
that there's some causal link between raised glucose levels and
bodily damage. However it doesn't automatically follow that lowering
glucose levels (and by how much do you want to lower them?) will solve
problems. Context is very important.
(And even this is imperfect as some people are naturally more
resistant to this damage and some are more sensitive, but... on
average...)
So levels of glucoraphanin metabolites may well be instructive. Dunno. If you were in the Southern Hemisphere and
trying to get back to the Northern Hemisphere you might use a compass to
tell you in which direction to head, but you'd not extrapolate from
that bit of information to say that you were actually IN the Northern
Hemisphere. It's just a pointer. Some pointers, or proxy markers, are better indicators of where you might be.
I don't know how well [
changes in blood profile of chemical X due to more glucoraphanin in broccoli] acts as a marker for good health - that's the next thing to investigate.
I'm fairly behind the idea that people with more of the brassica-type
vegetables (broccoli, cabbage, brussel sprouts etc) in their diet are
healthier than those without. But it's important to remember that even
though there are probably health benefits from chemicals in the veg (not
to mention "roughage") it's also the case that the types of people who
prioritise vegetables at their meals might be different in other ways
from people who don't (eg deprivation scores, smoking risk). Healthy and
unhealthy behaviours can co-exist but 'people who go to the gym' are
often 'people who don't smoke' and 'people who eat vegetables'.
But studies do imply that eating broccoli (any broccoli)
reduces risk of cancer - the Beneforte thing is trying to increase that
further. But I don't know if it does yet.
Cancer is a complex thing and there are probably other things that have more of an impact on its development than [more glucoraphanin] or [less glucoraphanin].
For example there's heredity (genetics but
shared lifestyles too), age, activity, overall diet, smoking, certain
medications, environmental damage - eg the effects of sun damage and
skin cancers.
These factors might well weigh more heavily in one's risk of cancer, or other diseases, than the quality of one's broccoli.
So
it's not just about the evidence that one particular food is or isn't good for
you but
putting this bit of information in context with all the other bits of
information.
Also, I wonder if the knob of butter many people might add to a portion of Beneforte negates its healthful effects ;)
OK I'm going to stop now cos I've got a bit bored... and it's time for tea (yes, I will be having broccoli!)
A note on comments
As
this is an unfinished thinking out loud sort of post I'm not
particularly interested in comments telling me how great or not
Beneforte is. This post hasn't looked at that, it's looked at
how I would typically go about finding that out.
Further things to look at
New Phytol. 2013 Jun;198(4):1085-95. doi: 10.1111/nph.12232. Epub 2013 Apr 8.
Genetic regulation of glucoraphanin accumulation in Beneforté broccoli.
Nothing to do with any health benefits of the broccoli, as far as I can tell from the abstract, but about how the plant manages its stores of glucoraphanin.
There
are no trials listed at ClinicalTrials.gov that mention Beneforte (even
with the acute e spelling) but five that mention glucoraphanin.
ClinicalTrials.gov is where I generally expect to find evidence from a
variety of clinical trials. There's also Controlled-Trials, a similar
sort of site.
Here are some that mention the precursor, glucoraphanin and there's a link to more trials below looking at the active ingredient sulforaphane.
1 Completed
Broccoli Sprout Intervention in Qidong, P.R. ChinaCondition: Environmental Carcinogenesis
Interventions: Drug: Broccoli Sprout Extract Beverage; Drug: placebo beverage
Just looking at metabolites, not really a trial of health benefits
2 Completed
Cross-Over Broccoli Sprouts TrialCondition: Healthy
Intervention: Dietary Supplement: broccoli sprouts extract
Measuring metabolites (in urine) in healthy people given a broccoli sprouts extract, not really a trial of health benefits.
3 Not yet recruiting
Pilot Study Evaluating Broccoli Sprouts in Advanced Pancreatic CancerCondition: Pancreatic Ductal Adenocarcinoma
Interventions: Dietary Supplement: Verum, broccoli sprout grain; Dietary Supplement: placebo
This
one hasn't started yet but it will actually be looking to see if the
supplements can increase the survival of people with a particular cancer
that is being treated with chemotherapy.
4 Completed
The Effect of Broccoli Sprouts as a Nutritional Supplement in the Prevention of Cardiovascular DiseaseConditions: Diabetes Mellitus; Hypertension; Hypercholesterolemia; Cardiovascular Disease
Intervention: Behavioral: Daily intake of broccoli sprouts
Although
the title sounds promising it's a study of the effect of broccoli on
blood vessel function - that's not to diminish the study, mind.
5 Active, not recruiting
Diet and Vascular Health StudyCondition: Cardiovascular Disease
Interventions: Dietary Supplement: Diet and Vascular Health; Dietary Supplement: Diet and Vascular Health Study
They'll be measuring things ('markers') in the blood, like cholesterol, to determine if there are changes in these markers after eating this broccoli for a few weeks.
There are also 26 studies that mention the active metabolite of glucoraphanin:
sulforaphane (some will be the same as those above)