Updated: Nov 10, 2009
More than 270 plant species have been identified as having hypoglycemic potential. Many of these plants are used in developing countries in the treatment of diabetes. The most well known of these plants are listed below:
Most of the plants studied have shown minimal-to-moderate effects on glucose regulation, with the exception of ackee fruit and bitter melon. Bitter melon produces hypoglycemia via steroidal saponins (charantin, insulinlike peptides, and alkaloids), but it has never been reported to result in fatality. This article focuses on the potentially fatal effects produced by ackee fruit ingestions. Ackee fruit causes profound hypoglycemia due to hypoglycin A, a toxic compound contained in the fruit. In addition, several references regarding other plants with hypoglycemic effects have been included.
Ackee fruit is produced biannually by the tropical evergreen tree, Blighia sapida. Although indigenous to West Africa, it is commonly found in the Caribbean islands, Central America, South America, and southern Florida. In South America, the fruit has been used to treat colds, fever, and diseases as varied as edema and epilepsy, though no clinical trials support these uses. In Jamaica, ackee fruit is a food staple, commonly prepared like scrambled eggs or boiled with fish. The fruit itself is 10 cm wide and weighs 100 g. It houses 3 glossy, black seeds contained within a straw- to red-colored husk and covered by a thick, oily appearing yellow aril. The outer aril is closed in unripe ackee fruit. Upon ripening, the aril spontaneously opens. Unripe fruit and the water used to cook it are toxic and cause Jamaican vomiting sickness when ingested.
Fatal epidemics of this illness have been well studied in Haiti, West Africa, and Jamaica. These epidemics tend to coincide with food shortages. The disease is characterized by profound hypoglycemia and intractable vomiting. Before widespread recognition of the hypoglycemia produced by this illness, the mortality rate approached 80%.
Two water-soluble toxins are present in unripe ackee fruit, hypoglycin A and hypoglycin B. Hypoglycin A is L-alpha-amino-beta-[methylene cyclopropyl]propionic acid. Hypoglycin A is found in both the aril and the seeds of the unripe fruit. Hypoglycin B is a gamma-L-glutamyl derivative of hypoglycin A and is found only in the seeds of the fruit.
Hypoglycin A is metabolized by transamination and oxidative decarboxylation to form methylenecyclopropylacetic acid (MCPA). MCPA then forms nonmetabolizable carnitine and coenzyme A (CoA) esters, rendering them unavailable for other metabolic reactions. Hypoglycemia results because CoA and carnitine are required for long-chain fatty acid oxidation, and oxidation is required for gluconeogenesis. Thus, hypoglycemia results from an inability to perform gluconeogenesis. This inhibition of fatty acid metabolism also results in the accumulation of unusual dicarboxylic acids that are subsequently excreted in the urine such as 2-ethyl malonate, 2-methyl succinate, glutarate, and adipate.
Additionally, MCPA inhibits acyl-CoA dehydrogenases. Inhibition of butyryl CoA dehydrogenase stops the oxidation of long-chain fatty acids at the level of hexanoyl CoA and butyryl CoA, causing decreased production of nicotinamide adenine dinucleotide (NADH) and acetyl CoA. Their lowered concentration further inhibits gluconeogenesis. Hypoglycin A does not affect insulin release or serum insulin levels in animal models.
It is postulated that increased concentrations of glutaric acid may have an inhibitory effect on glutamic acid decarboxylase, causing a decrease in GABA production and an increase in concentration of glutamate. This mechanism can explain the proconvulsive effect of hypoglycin A.
The true incidence of ackee poisoning is unknown. Ackee fruit sales are illegal in the United States, likely leading to underreporting. Cases have been reported after consumption of fruit illegally shipped or transported by travelers. Several isolated, nonfatal cases have been reported in Ohio, Connecticut, and New York.
Though shipment of ackee fruit into the United States is still banned, the Food and Drug Administration (FDA) is considering modifying this ban. Research by Whitaker et al has led to evaluation of sampling plans to detect hypoglycin A in ackee fruit. This research will help the FDA to develop a cost-effective monitoring program to reduce lots of misclassified product and to increase consumer safety.1,2
Ackee poisoning has killed an estimated 5,000 people since 1886. Children are more likely than adults to experience fatal complications of ackee poisoning. The most well-studied epidemics have been in Haiti, Jamaica, and West Africa.
Reported cases in Africa, Jamaica, and Haiti occurred in blacks.
In reported cases, no difference in sex distribution was noted.
Poisoning is more common in persons younger than 15 years, and severe poisoning is more common in the pediatric population.
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Fatty liver of pregnancy
Chronic valproic acid use
Chronic nucleoside analog (eg, didanosine [DDL], zidovudine [AZT]) use
Ingestion of outdated tetracycline
Ingestion of oral hypoglycemics (sulfonylureas) (eg, metformin, phenformin, chlorpropamide)
Quinine ingestion
Disopyramide ingestion
Pentamidine ingestion
Streptozotocin exposure
Vacor exposure
Herbal product and tea consumption (eg, pennyroyal oil, margosa oil, comfrey, chaparral, germander, groundsel or senecio, Jin Bu Huan, and Syo-saiko-to)
Supportive treatment with glucose, fluid, and electrolyte replacement is the mainstay of therapy. Antiemetics are used to control vomiting, and benzodiazepines are used to control seizures. Supplemental carnitine may be considered, although it has not been studied in this context.
These agents are used to adsorb toxin in the GI tract, limiting systemic adsorption.
Emergency treatment in poisoning caused by drugs and chemicals. Network of pores present in activated charcoal adsorbs 100-1000 mg of drug per gram of charcoal. Does not dissolve in water.
For maximum effect, administer as soon as possible after ingesting poison.
1 g/kg PO (generally 50-100 g)
<1 year: Not recommended
>1 year: 1-2 g/kg PO (generally 15-30 g)
Effectiveness of other medications decreases with coadministration; do not mix charcoal with sherbet, milk, or ice cream (decreases adsorptive properties)
Documented hypersensitivity; co-ingestion of caustic substances; unprotected airway, high aspiration risk
A - Fetal risk not revealed in controlled studies in humans
Dextrose is used to reverse hypoglycemia. Carnitine, an amino acid derivative, is synthesized from methionine and lysine and is required in energy metabolism. It can promote excretion of excess fatty acids in patients with defects in fatty acid metabolism or specific organic acidopathies that bioaccumulate acyl CoA esters.
Monosaccharide absorbed from the intestine and then distributed, stored, and used by the tissues.
Parenterally injected dextrose is used in patients unable to sustain adequate oral intake. Direct oral absorption results in a rapid increase in blood glucose concentrations.
Dextrose is effective in small doses, and no evidence exists that it may cause toxicity. Concentrated dextrose infusions provide higher amounts of glucose and increased caloric intake in a small volume of fluid.
D50W (0.5-1 g/kg or 1-2 mL/kg) IV, followed by a D10W drip to maintain serum glucose level above 100 mg/dL
Neonates: D10W bolus
Young children: D25W bolus (0.5-1 g/kg or 2-4 mL/kg)
D10W in 0.2% NS at 7 mg dextrose/kg/min can be initiated as infusion, with frequent adjustments based on serum glucose evaluations and consultation with a pediatrician
Caution when administering parenteral fluids to patients receiving corticosteroids or corticotropin, especially if solution contains sodium ions
Diabetic coma if blood sugar levels are extremely high; do not administer concentrated solution if intraspinal or intracranial hemorrhage is present; avoid in patients who are dehydrated and diagnosed with delirium tremens, hepatic coma, or glucose-galactose malabsorption syndrome
A - Fetal risk not revealed in controlled studies in humans
Continuous infusions of >10% dextrose, not for infusion through peripheral line (may cause thrombosis; administer instead through central venous catheter)
May cause nausea when infused; IV dextrose solutions may result in dilution of serum electrolyte concentrations or overhydration when fluid overload occurs; caution in patients with congested states or pulmonary edema; caution in subclinical diabetes mellitus or carbohydrate intolerance; increased risk exists of inducing significant hyperglycemia or hyperosmolar syndrome if solution is administered rapidly, especially in patients with chronic uremia or carbohydrate intolerance; concentrated solutions should not be administered IM/SC; rates of dextrose infusion higher than 0.5 g/kg/h may produce glycosuria; at infusion rates of 0.8 g/kg/h, the incidence of glycosuria is 5%; monitor fluid balance, electrolyte concentrations, and acid-base balance closely; dextrose administration may produce vitamin B-complex deficiency
May facilitate transport of fatty acids into mitochondria. Carnitine has been used successfully in treatment of chronic valproate toxicity associated with hyperammonemia. Chronic valproate toxicity is thought to inhibit carnitine-dependent transfer of fatty acids from cytosol into mitochondria for beta-oxidation.
1-3 g/d PO divided in 3 or 4 doses; typical replacement dose is three 330-mg tabs tid; 50-100 mg/kg IV over 30 min bolus, followed by 15 mg/kg q4h over 10-30 min
50-100 mg/kg/d PO divided in 4 doses; 50 mg/kg IV over 30 min
None reported
Documented hypersensitivity
C - Fetal risk revealed in studies in animals but not established or not studied in humans; may use if benefits outweigh risk to fetus
Monitor blood chemistries, vital signs, and overall clinical condition of the patient; nausea, vomiting, abdominal cramps, and diarrhea may occur
These agents are used to reduce blood levels of GH glucagon and VIP peptides.
Acts primarily on somatostatin receptor subtypes II and V. Inhibits GH secretion and has a multitude of other endocrine and nonendocrine effects, including inhibition of glucagon, VIP, and GI peptides. Inhibits insulin release.
Initial: 50 mcg SC tid; may increase dose to 500 mcg tid
Doses of 300-6000 mcg/d or higher seldom result in additional biochemical benefit
Not established
May reduce effects of cyclosporine; patients on insulin, oral hypoglycemic agents, beta-blockers, or calcium channel blockers may need dosage adjustment
Documented hypersensitivity
B - Fetal risk not confirmed in studies in humans but has been shown in some studies in animals
Side effects primarily related to altered GI motility and include nausea, abdominal pain, diarrhea, and increased incidence of gallstones and biliary sludge; because of alteration in counter-regulatory hormones (ie, insulin, glucagon, GH), hypoglycemia or hyperglycemia may be seen; bradycardia, cardiac conduction abnormalities, and arrhythmias have been reported; because of inhibition of TSH secretion, hypothyroidism may also occur; exercise caution in patients with renal impairment; cholelithiasis may occur
Benzodiazepines may be used to treat seizures.
Sedative hypnotic with short onset of effects and relatively long half-life.
By increasing the action of gamma-aminobutyric acid (GABA), which is a major inhibitory neurotransmitter in the brain, may depress all levels of CNS, including limbic and reticular formation.
Important to monitor patient's blood pressure after administering dose. Adjust as necessary.
Dose is 0.05-0.1 mg/kg; usually, given at 4 mg/dose IV slowly over 2-5 min and repeat in 10-15 min prn; cumulative dose of 8 mg/d typically considered maximum
1-10 mg/d PO/IV/IM divided bid/tid
Infants and children: 0.05-0.1 mg/kg IV slowly over 2-5 min; repeat prn in 10-15 min at 0.05 mg/kg; not to exceed 4 mg/dose
Adolescents: 0.07 mg/kg IV slowly over 2-5 min and repeat in 10-15 min prn; not to exceed 4 mg/dose
Toxicity of benzodiazepines in CNS increases when used concurrently with alcohol, phenothiazines, barbiturates, and MAO inhibitors
Documented hypersensitivity; preexisting CNS depression, hypotension, and narrow-angle glaucoma; reversal agents (eg, flumazenil) contraindicated when lorazepam used for life-threatening conditions (eg, control of intracranial pressure or status epilepticus)
D - Fetal risk shown in humans; use only if benefits outweigh risk to fetus
Caution in renal or hepatic impairment, myasthenia gravis, organic brain syndrome, or Parkinson disease; use caution when sedating patients with profuse vomiting because aspiration may result
Antiemetics may be used to control severe and persistent vomiting. Agents in this class may also prevent nausea and vomiting associated with emetogenic cancer chemotherapy
Selective 5-HT3-receptor antagonist that blocks serotonin both peripherally and centrally. Prevents nausea and vomiting associated with emetogenic cancer chemotherapy (eg, high-dose cisplatin) and complete body radiotherapy.
Three 0.15 mg/kg (maximum 4 mg) IV doses over 2-5 min; usually administered at 4-mg increments that can be repeated; not to exceed maximum cumulative dose of 32 mg
<40 kg: 0.1 mg/kg IV over 2-5 min
>40 kg: 4 mg IV over 2-5 min
Although potential for cytochrome P-450 inducers (barbiturates, rifampin, carbamazepine, and phenytoin) to change half-life and clearance of ondansetron, dosage adjustment is not usually required
Documented hypersensitivity
B - Fetal risk not confirmed in studies in humans but has been shown in some studies in animals
May cause headache
Stimulates motility of the upper GI tract. Dopamine antagonist that stimulates acetylcholine release in the myenteric plexus. Acts centrally on chemoreceptor triggers in the floor of the fourth ventricle, providing important antiemetic activity.
10 mg IV/IM q2-3h prn
0.5-2 mg/kg IV q2-4h prn; not to exceed adult dose
Anticholinergic agents may antagonize effects of metoclopramide; opiate analgesics may increase metoclopramide toxicity in CNS
Documented hypersensitivity; pheochromocytoma or GI hemorrhage, obstruction, or perforation; history of seizure disorders
B - Fetal risk not confirmed in studies in humans but has been shown in some studies in animals
Caution in history of mental illness and Parkinson disease
At chemoreceptor trigger zone, blocks serotonin peripherally on vagal nerve terminals and centrally.
10 mcg/kg IV over 5 min
Administer as in adults
CYP-450 3A substrate, inducers (eg, phenobarbital) may decrease granisetron effect, while inhibitors (eg, erythromycin, clarithromycin) may increase granisetron toxicity
Documented hypersensitivity
B - Fetal risk not confirmed in studies in humans but has been shown in some studies in animals
Caution in liver disease
Patients with the following conditions after ackee fruit poisoning should be admitted to the hospital:
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Persuad TVN. Foetal abnormalities caused by the active principle of the fruit of Blighia sapida (Akee). West Indian Med J. 1967;16:193-97.
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ackee fruit poisoning, hypoglycemia, ackee fruit, Jamaican vomiting sickness, hypoglycin, hypoglycin A, vomiting, Blighia sapida, B sapida, gourd bitter melon, herb fenugreek, pomegranate fruit, climbing ivy gourd, mamijava, Asian ginseng, American ginseng, Siberian ginseng, ginseng, Momordica charantia, M charantia, Trigonella foenum-graecum, T foenum-graecum, Coccinia indica, C indica, Enicostemma littorale, E littorale, Panax ginseng, P ginseng, Panax quinquefolius, P quinquefolius, Eleutherococcus senticosus, E senticosus
Jennifer Coles Schecter, MD, Staff Physician, Department of Emergency Medicine, Lahey Clinic, Burlington, MA
Disclosure: Nothing to disclose.
Sage W Wiener, MD, Assistant Professor, Department of Emergency Medicine, State University of New York Downstate, Director of Medical Toxicology, Department of Emergency Medicine, Kings County Hospital Center
Sage W Wiener, MD is a member of the following medical societies: American Academy of Clinical Toxicology, American Academy of Emergency Medicine, American College of Medical Toxicology, and Society for Academic Emergency Medicine
Disclosure: Nothing to disclose.
B Zane Horowitz, MD, FACMT, Professor, Department of Emergency Medicine, Oregon Health and Sciences University; Medical Director, Oregon Poison Center; Medical Director, Alaska Poison Control System
B Zane Horowitz, MD, FACMT is a member of the following medical societies: American Academy of Clinical Toxicology and American College of Medical Toxicology
Disclosure: Nothing to disclose.
John T VanDeVoort, PharmD, Regional Director of Pharmacy, Sacred Heart & St. Joseph's Hospitals
John T VanDeVoort, PharmD is a member of the following medical societies: American Society of Health-System Pharmacists
Disclosure: Nothing to disclose.
Michael Hodgman, MD, Assistant Clinical Professor of Medicine, Department of Emergency Medicine, Bassett Healthcare
Michael Hodgman, MD is a member of the following medical societies: American College of Medical Toxicology, American College of Physicians, Medical Society of the State of New York, and Wilderness Medical Society
Disclosure: Nothing to disclose.
John D Halamka, MD, MS, Associate Professor of Medicine, Harvard Medical School, Beth Israel Deaconess Medical Center; Chief Information Officer, CareGroup Healthcare System and Harvard Medical School; Attending Physician, Division of Emergency Medicine, Beth Israel Deaconess Medical Center
John D Halamka, MD, MS is a member of the following medical societies: American College of Emergency Physicians, American Medical Informatics Association, Phi Beta Kappa, and Society for Academic Emergency Medicine
Disclosure: Nothing to disclose.
Asim Tarabar, MD, Assistant Professor, Director, Medical Toxicology, Department of Emergency Medicine, Yale University School of Medicine; Consulting Staff, Department of Emergency Medicine, Yale-New Haven Hospital
Disclosure: Nothing to disclose.
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