TNF in bananas?

I received a question about bananas from Mom last week (exciting!), but have only had time to respond to it today (Sorry mom, been very busy analyzing all ye poop samples!). Anyway, mom's question goes,

Hi Ben,

Is it true that a full ripe banana with dark patches on d skin produces TNF ( tumor necrosis factor) which has the ability to combat abnormal cells. Therefore the riper the banana the better the anti cancer quality. Pls enlighten us. Tq

Very interesting question, mom.

I actually did some research online and found this Japanese journal article, and what I can say is that I am actually quite skeptical. There are a few reasons for my skepticism.

1. This is actually a mice model. You all outside of the scientific community have no idea how mice model results failed to transpose to humans.

2. The banana extract is given intravenously to mice. Anybody with some biology in high school will understand that taking things orally and intravenously can be totally different. If the Japanese scientists found that there are increase in immune cells in the mice, I would argue that anything that is injected intravenously would somehow induce the immune response against this xenobiotic, hence the proliferation of immune cells.

From a food scientist point of view, again I am skeptical that the black part of the bananas are producing TNF. Why?

1. We understand the blackening of bananas as one of the two mechanisms: a. The diminishing of carotenoids, hence exposing black pigments or b. The aggregation of compounds, creating a mass of black pigments, hence covering up the indigenous yellow pigments. I am more inclined towards the latter. We also know that banana emits ethylene constantly (Yes, banana is an ethylene producing machine, so if you want to ripen whatever fruit, just put it in a bag with bananas, and yes if you put it one day longer, everything will rot, haha!). So the black pigments are actually signs of cell death. Just like when you put your bananas in the refrigerator. Bananas are so chill-labile, that once exposed to even refrigeration temperature (4 deg Celsius), oxygen transfer across the cell membrane becomes impaired, so your banana dies and becomes black.

2. Even if bananas produces TNF, how likely is it to survive your stomach acid and digestive proteases in your gastrointestinal tract, and still is able to be absorbed into your bloodstream intact as TNF? We all know that TNF is a protein complex, and most protein complex diminishes into smaller units to aid transfer into the bloodstream.

All in all, I just think that this needs more research. We can either do an oral challenge in mice model again, or simply do a human study (It's not like you're feeding them arsenic, you're feeding them banana extract, duh!)

So, if you think you should eat black bananas versus yellow bananas, you are wise. It's not because it produces TNF, it's because it's sweeter and tastier (because most starch have broken down to simple sugars by now).


I hope I answered your question, mom.

Schizophrenia

It's been a really long time since that very first post on my food science blog. Well, nobody actually follow my blog, but anyway....Today we are going to look into something different. We are going to talk about Schizophrenia.

According to the National Institute of Health (NIH), schizophrenia is defined as "a complex mental disorder that makes it difficult to 1) tell the difference between real and unreal experiences, 2) think logically, and 3) have normal emotional responses, among other symptoms. A lot of the times, an individual that is genetically more prone to developing schizophrenia will have had long term exposure and mishandling of stress and emotional instability, and certain life events would actually trigger the onset of schizophrenic symptoms.

It is believed that schizophrenia is actually life-long, and symptoms can only be suppressed (not cured) via medication to control the brain chemical composition/distribution.

I, being a food scientist, can only offer a few dietary suggestions for schizophrenic patients to follow. Keep in mind, that I am not a registered dietitian, nor a psychiatrist. I am only providing some of my thoughts after years of formal training in food science and nutrition, to alleviate some high potential side effects that may bring about by long term medication.

It is almost common sense that metabolism of every chemical compounds (including pharmaceuticals) takes place in the liver, mainly by Cyt P450 via Stage 1 and Stage 2 metabolism. It is also known that most patients who received constant medication (regardless of symptoms) will very likely to develop organ damage primarily in the liver, and sometimes the kidney. To relate a personal experience, my grandma had suffered severe Alzheimer's disease and schizophrenia before she died. Consequential of the daily medication that she consumed, she also developed stones in her gallbladder. The symptoms were so intense, as a matter of fact, she died due to complications and pain caused by the gall stone (and not schizophrenia).

Coming back to our discussion here, so to "protect" your organs, mainly the liver, I would suggest that patients consume Vitamin B complex (B1, B2, etc. ). Vitamin B complex is known widely to enhance the immune and nervous system, and works as a "natural" tranquilizer, among some of the health benefits. To aid in the tranquilizing effects synergistically, I would suggest that patients also consume foods rich in/supplements serving calcium and magnesium. These two macrominerals are essential key players in aiding in the parasympathetic nervous system (i.e. peristalsis in the gut, salivation, palpitation). So they will absolutely aid in relieving the symptoms. Also, Vitamins C and E, and other antioxidative phenolics to help in counteracting the oxidative effects in the body.

Selective diet is also very important. I would suggest that patients increase their fruits and vegetables intake as an overall. Mild exercise and relaxation practices (i.e. Taichi, yoga) will definitely improve both the patients' mental and physical abilities.

But the most important players here are the family members. Love makes everything turn okay. :)