Grape fruit and naringin - A way to increase exposure to beneficial bioactives from foods.

Grape fruit contains an interesting polyphenol called naringin.

Naringin, inhibits at least two enzymes in humans called CYP1A2 and  CYP3A4.


The use of this functional food method is to increase beneficial effects of bioactive in from you food and supplements or what you consume during the naringin-induced "open window" time-frame.

So beware of what you expose yourself to. Avoid toxic doses of substances of all kinds and focus on foods and supplements with minimal if any side effects.

My theory here is to go more with fruit plants than vegetables for this method.

Also avoid combining with medication and drugs in particular (like statins etc.. see interaction table). 

A good protocol would be to increase the activity of other low level toxicity plants like berries, avocado, olives, moderate amount of coffee etc.

Also the timing may play a crucial role here, because of the delay of CYP-metabolism.

You should aim to get your coffee and other strong CYP-dependent foods and beverages in as early as possible and in limited amounts, since the effects of them will be enhanced.

The purpose of this strategy is to enhance the beneficial effects of various substrates like polyphenols of various forms, for example anthocyanins from blueberries and theobromine from cacao etc.  


It can be useful to know which genotype you have on the corresponding genes.

Note that CYP1A2 in particular is involved in the breakdown of caffeine/caffeine metabolism,

so if you are a slow caffeine metaboliser, you might have to be more careful about combining, grape fruit and large amounts of coffee (or other caffeine containing foods/beverages).

The average half-life of naringin in humans is between 2.5 and 3 hours. I have not investigated the  magnitude of variation from the mean, or what effects the breakdown/metabolisation of naringin.

This is a very interesting topic and should be investigated more.


Naringin itself is metabolised by enzymes belonging to the P450 (CYP), in particular CYP1A2 and CYP3A4 are involved in the degradation of naringin itself, in which case there is a recursive relationship that suggests an exponential decreasing reverse bell-curve of the optimal range. So it should be advised not to double down on grape fruit consumption, but rather stay on the lower side and increase slowly per occasion and evaluate the effects.

One study found that naringin inhibited CYP3A4 activity by up to 43% at a concentration of 100 µM, while another study reported an inhibition of up to 87% at a concentration of 50 µM. Similarly, naringin has been shown to inhibit CYP1A2 activity by up to 55% at a concentration of 100 µM.


The two CYP enzymes differ subtly in what substrates they target: 

CYP1A2 is primarily involved in the metabolism of caffeine, theophylline, and certain medications such as clozapine, fluvoxamine, and some antidepressants. It is also involved in the metabolism of polycyclic aromatic hydrocarbons found in cigarette smoke and certain foods.


CYP3A4, on the other hand, is involved in the metabolism of a wide range of drugs including many anticancer drugs, immunosuppressants, statins, and some antibiotics. It is also involved in the metabolism of certain natural compounds such as phytochemicals and steroid hormones.


In terms of their differences in metabolism, CYP1A2 is generally considered to have a higher affinity for smaller molecules with planar structures, while CYP3A4 has a wider substrate specificity and can metabolize larger molecules. Additionally, the two enzymes differ in their expression levels and distribution throughout the body, with CYP3A4 being more abundant in the liver and CYP1A2 being more abundant in the lungs.


(TODO add references)

Other enzymes like UPD-glucuronosyltransferases (UGTs) and sulfotransferases (SULTS) may also play roles in the metabolism of nangirin.


Grape fruit nutrients table including polyphenols.

Note that nangirin is the key polyphenol of this biohack.

SubstanceConcentration (per 100g)Beneficial to HealthInteractions (comma-separated list)
Water88gYes-
Calories42 kcal--
Carbohydrates10.7g--
Dietary Fiber1.6gYes-
Protein0.8g--
Fat0.1g--
Vitamin C31.2mgYes-
Folate21mcgYes-
Potassium135mgYes-
Thiamin0.03mgYes-
Niacin0.2mgYes-
Calcium22mgYes-
Magnesium9mgYes-
Phosphorus18mg--
Iron0.1mg--
Zinc0.1mg--
Sodium0mg--
Naringin700mgYesStatins, Calcium channel blockers, Antibiotics
Hesperidin200mgYesN/A
Apigenin10mgYesN/A
Narirutin200mgYesN/A
Neohesperidin50mgYesN/A
Poncirin10mgYesN/A

Interactions:

Compound 1Compound 2Severity DegreeDose for Side EffectIn VitroHumanIn VivoInteractionInteracting Parts
NaringinStatinsHighNormal doseYesYesYesNaringin can inhibit the metabolism of statins, leading to increased drug levels and increased risk of side effects.Not specified
NaringinCalcium channel blockersHighNormal doseYesYesYesNaringin can inhibit the metabolism of calcium channel blockers, leading to increased drug levels and increased risk of side effects.Not specified
NaringinAntibioticsModerateHigh doseYesYesYesNaringin can inhibit the activity of certain antibiotics, reducing their effectiveness.Not specified

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