Nutritional Management of Liver Disease • • • • • • • • Review the functions of the liver Review diseases of the liver Major complications of liver disease Nutritional features of end stage liver disease Nutritional management of end stage liver disease Nutritional response to hepatic transplantation Nutritional management of non alcoholic fatty liver disease (NAFLD) Hepatitis C Functions of the Liver Major role of the liver is the regulation of solutes in the blood that affect the functions of other organs for example: the brain, heart, muscle and kidneys Strategically placed such that all blood passing from the small intestine must travel through the liver Functions of the Liver Storage and metabolism of macronutrients such as protein, carbohydrates and lipids Metabolism of micronutrients – vitamins and minerals Metabolism and excretion of drugs and toxins – endogenous and exogenous Role of the Liver in Nutrient Metabolism Storage and metabolism of macronutrients such as protein, carbohydrates and lipids Carbohydrate Storage of carbohydrate as glycogen Gluconeogenesis Glycogenolysis Role of the Liver in Nutrient Metabolism Protein Synthesis of serum proteins e.g. albumin Synthesis of blood clotting factors Formation of urea from ammonia Oxidation of amino acids Deamination or transamination of amino acids Role of the Liver in Nutrient Metabolism Fat Hydrolysis of triglycerides, cholesterol and phospholipids to fatty acids and glycerol Formation of lipoproteins Ketogenesis Role of the Liver in Nutrient Metabolism Fat Fat storage Cholesterol synthesis Production of bile necessary for digestion of dietary fat Role of the Liver in Nutrient Metabolism Vitamins Site of the enzymatic steps in the activation of vitamins : thiamine pyridoxine folic acid vitamin D(25 hydroxycholecalciferol) Site of the synthesis of carrier proteins for vitamins: A, B12, E Role of the Liver in Nutrient Metabolism Storage site for fat soluble vitamins A, D, E, K, B12 Minerals Storage site for copper iron and zinc Diseases of the Liver Hepatitis Inflammation of hepatocytes Reversible Precipitants include: Viral infections such as hepatitis A, B, C Drugs such as paracetamol Some herbal preparations Alcohol Fatty Liver: Infiltration of the liver by fat Possible causes include: alcohol obesity type 2 diabetes mellitus hyperlipidaemia sudden rapid weight gain hepatitis C TPN NAFLD (Non Alcoholic Fatty Liver Disease) Resembles alcohol induced fatty liver Occurs in people who do not abuse alcohol Has the potential to progress to cirrhosis and liver failure Non Alcoholic Fatty Liver Disease (NAFLD) Simple steatosis Steatohepatitis (NASH) Fibrosing steatohepatitis Cirrhosis Non Alcoholic Fatty Liver Disease (NAFLD) Risk Factors include: Overweight Obesity Central Obesity Non Alcoholic Fatty Liver Disease (NAFLD) Factors involved in the development of NAFLD: Lifestyle : Weight gain Weight loss Reduced activity Childhood and adult obesity Type 2 diabetes Non Alcoholic Fatty Liver Disease (NAFLD) The major underlying risk factor for the development of NAFLD is insulin resistance NAFLD (Non Alcoholic Fatty Liver Disease) Prevalence of obesity in patients with NAFLD reported between 30% and 100% Prevalence of type 2 diabetes in patients with NAFLD reported between 10% and 75% Prevalence of hyperlipidaemia in patients with NAFLD reported between 20% and 92% NAFLD - Symptoms Often asymptomatic of liver disease at time of diagnosis Fatigue or malaise and/or a feeling of fullness or discomfort on the right side of the abdomen NAFLD - Symptoms Mild to moderate elevation of the enzymes: aspartate amino transferase alanine amino transferase Diagnosis confirmed on biopsy Cirrhosis Refers to chronic scarring of the liver Clearly delineated nodules form within the liver which contain connective tissue This leads to a significant reduction in liver function Fulminant Hepatic Failure Sudden massive necrosis of hepatocytes The patient rapidly becomes encephalopathic and comatosed Causes may be viral or a reaction to a drug such as paracetamol, sulphathiazone or some herbal remedies Autoimmune liver diseases Diseases of the biliary tract and include primary sclerosing cholangitis (PSC) and primary biliary cirrhosis (PBC) PSC often occurs in association with ulcerative colitis Serum cholesterol levels may be elevated and unresponsive to medication or dietary manipulation Alcoholic liver disease Alcohol is toxic to the liver Caused by chronic alcohol abuse All stages of the disease process – hepatitis, fatty liver fibrosis and cirrhosis Alcoholic liver disease Cessation of alcohol may result in recovery in the early stages of liver disease Cessation of alcohol in patient with cirrhosis may result in an improvement in liver function and may also result in a slowing down of the disease progression Wilson’s Disease Copper storage disease May result in cirrhosis if untreated First presentation often in adults who present with cirrhosis Wilson’s Disease If detected in childhood management involves penecillamine which acts to bind Cu in the GIT Value of dietary Cu restriction debatable in children; of no value in adults in the presence of cirrhosis Hepatic tumours Often occur in association with Hepatitis B or Hepatitis C Occur independently Include hepatocellular carcinomas, cholangiosarcoma (bile duct tumours) Portal Hypertension Occurs as a result of fibrous infiltration of the liver which in turn causes increased pressure in the portal vein This pressure continues back through the system to the abdominal capillaries which then leak serous fluid into the abdominal cavity due to this increased pressure and low serum albumin levels Portal Hypertension Surgical interventions may be undertaken to alleviate this pressure (TIPSS). There are risks associated with these procedures – infection, failed shunts, encephalopathy Cirrhosis Compensated i.e. well controlled or Decompensated i.e. symptomatic Decompensated cirrhosis Symptoms of portal hypertension include: Ascites and/or peripheral oedema Jaundice Oesophageal and/or gastric varices Encephalopathy Hepatorenal failure Malnutrition Ascites Refers to the accumulation of fluid in the abdominal cavity It contains protein, sodium and potassium It is considered to be an active metabolic unit Jaundice Refers to the yellow colour seen in patients with liver disease It is caused by high circulating levels of bilirubin Severe itching may be present. May be alleviated by Questran/cholestyramine or by phenergan Varices Distended/engorged veins that can occur at any point in the venous system of the GIT May bleed readily as patients with end stage liver disease (ESLD) have poor coagulation secondary to impaired synthesis of clotting factors Encephalopathy Impaired mental state that results in impaired mentation and coordination May result in coma Believed to be caused by increases in plasma ammonia and other nitrogenous waste products These toxins cross the blood brain barrier and interfere with neuromuscular function and behaviour Precipitants of encephalopathy include: Peritoneal infection (subacute bacterial peritonitis – SBP) GIT bleeding Poor compliance with lactulose (marketed as Duphalac) therapy Nitrogen overload Fluid and electrolyte imbalance Medications Acid-base imbalance There are four classifications of encephalopathy: Grade1. foetor, impaired coordination, tremor, altered handwriting, reduced attention span, mild confusion, mood swings and altered sleep pattern Grade 2. asterixis (impaired ability to draw a star), slurred speech, ataxia inappropriate behaviour, lethargy, impaired memory and mild disorientation Classifications of encephalopathy cont… Grade3. bizarre behaviour, confusion, moderate to severe disorientation, uncharacteristic anger, paranoia, somnolence, stupor and muscle rigidity Grade 4. comatosed, dilated pupils Nutritional Management of Liver Disease Early Stages of Liver Disease: No specific dietary management Healthy diet according to healthy eating guidelines Beware of miracle cures Acute Hepatitis: High protein/high energy intake required to promote hepatocyte regeneration • Fat restriction contraindicated • Nausea/anorexia • Consider oral supplementation such as glucose polymers, fruit based high protein drinks, or high protein/ high energy drinks in the presence of nausea/anorexia Caution against herbal remedies as some may be harmful and most have no scientific basis Nutritional Features of End Stage Liver Disease Look malnourished Low se protein levels albumin, prealbumin, transferrin, retinol binding protein, insulin like growth factor-1 Vitamin deficiencies thiamine, vit A, D, E Mineral deficiencies Zn, Mg, Cu, Ca Nutritional Features of Liver Disease Weight and BMI do not reflect true nutritional status (ascites and/or oedema) Oral intakes are not necessarily poor Exhibit features of protein energy malnutrition Nutritional Assessment of patients with ESLD Weight? Weight history? Protein markers of nutritional status? Descriptive history of wasting? Skinfolds? Intake? Appetite? Nutritional Assessment of patients with ESLD SGA for patients with liver disease (Hasse) Anthropometry Food history Nausea Anorexia Taste changes Diarrhoea Early satiety Functional capacity Grip strength Malnutrition in End Stage Liver Disease Changes in Macronutrient Metabolism: Energy Fat Protein Nutritional Management of End Stage Liver Disease Energy Requirements: Patients with compensated cirrhosis do not appear to need modification of their energy intakes Patients with decompensated liver disease require 35 – 40 non protein kcals/kg/day* Ascites is a viable metabolic unit *Plauth M, Merlim, Kondrup J, Weimann A, Ferenci P, Muller MJ.ESPEN Guidelines for Nutrition in Liver Disease and Transplantation. Clinical Nutrition 1997; 16: 43-55 Nutritional Management of End Stage Liver Disease Energy Energy expenditure: currently there are no metabolic equations which are able to estimate accurately the energy requirements of the patient with ESLD. Harris-Benedict, Schofields and Muller all underestimate the energy requirements of this group Indirect calorimetry Nutritional Management of End Stage Liver Disease Glycogen storage Reduced glycogen storage capacity Unable to tolerate periods of prolonged fasting – increased protein breakdown in periods of prolonged fasting Nutritional Management of End Stage Liver Disease Fat Altered fat synthesis Lipids are oxidised as a preferential substrate Increased lipolysis Active mobilisation of lipid stores Decompensated Liver Disease Fat restriction contraindicated in most patients Symptoms of fat intolerance such as steatorrhoea, abdominal pain or nausea following a high fat intake are rare. If present fat modification may be necessary Nutritional Management of End Stage Liver Disease Protein Protein turnover in cirrhotic patients is normal or increased Stable cirrhotics have increased protein requirements¹׳² Stable cirrhotic patients are capable of achieving positive nitrogen balance during aggressive nutritional support regime¹׳² ¹Kondrup J, Neilsen K et al. Effect of long term refeeding on protein metabolism in patients with cirrhosis of the liver. Br J Nutr 1997; 77: 197-212 ²Swart, GR et all. Minimal protein requirements in liver cirrhosis determined by nitrogen balance measurements at three levels of protein intake. Clin Nutr 1989; 8: 329-336 Nutritional Management of End Stage Liver Disease Protein Protein turnover in cirrhotic patients is normal or increased Stable cirrhotics have increased protein requirements¹׳² Stable cirrhotic patients are capable of achieving positive nitrogen balance during aggressive nutritional support regime¹׳² ¹Kondrup J, Neilsen K et al. Effect of long term refeeding on protein metabolism in patients with cirrhosis of the liver. Br J Nutr 1997; 77: 197-212 ²Swart, GR et all. Minimal protein requirements in liver cirrhosis determined by nitrogen balance measurements at three levels of protein intake. Clin Nutr 1989; 8: 329-336 Nutritional Management of End Stage Liver Disease Protein Protein refeeding showed a 30% increase in protein synthesis* Protein refeeding did not show a significant increase in protein degradation* *Kondrup J, Neilsen, K,and Anders J. Effect of long term refeeding on protein metabolism in patients with cirrhosis of the liver. Br J Nutrition (1997), 77, 197-212 Nutritional Management of End Stage Liver Disease Protein Patients with cirrhosis have been shown to have high protein requirements to maintain positive nitrogen balance* *Konrup J, Nielsen K, Juul A. Effect of long-term refeeding on protein metabolism in patients with cirrhosis of the liver. Br. J. Nutr. 1997; 77: 197-212 Nutritional Management of End Stage Liver Disease Protein The protein restricted diets used traditionally have probably arisen historically from the response to a dietary protein load seen in cirrhotic patients who have some form of portocaval shunt surgery Nutritional Management of End Stage Liver Disease Protein requirements in episodic hepatic encephalopathy 62 patients with acute encephalopathy assessed – 32 excluded 30 patients randomised into two groups All patients received lactulose enema and then identical oral neomycin dosage Cordoba J, Lopez-Hellin J et al. Normal protein diet for episodic hepatic encephalopathy: results of a randomised study. J of Hepatology 41 2004) 38-43 Nutritional Management of End Stage Liver Disease 20 patients completed study 5 patients in each arm dropped out – 4 deaths in each. Group A: additional variceal bleed; group B: additional voluntary abandon Nutritional Management of End Stage Liver Disease 2 groups – 15 in each group 14 days Group A: 0g protein/day for 3 days. Protein increased incrementally to 1.2g protein/kg/day Group B: 1.2g protein/kg/day Protein synthesis and breakdown studied at day 2 and day 14 Nutritional Management of End Stage Liver Disease Day 2: Increased protein breakdown in protein restricted group No statistically significant difference in protein synthesis Nutritional Management of End Stage Liver Disease Nutritional Management of End Stage Liver Disease Restricting protein intake did not have any positive effect on the evolution of episodic hepatic encephalopathy Nutritional Management of End Stage Liver Disease Protein Protein restriction is contra - indicated for patients with decompensated cirrhosis Recommended protein intake for cirrhotics is 1.0 – 1.5g protein/kg/day¹ Dietary protein restriction does not appear to be of any benefit in episodic hepatic encephalopathy² ¹Plauth M, Merlim, Kondrup J, Weimann A, Ferenci P, Muller MJ.ESPEN Guidelines for nutrition in Liver Disease and Transplantation. Clinical Nutrition 1997; 16: 43-55² ²Cordoba J, Lopez-Hellin J et al. Normal protein diet for episodic hepatic encephalopathy: results of a randomised study. J of Hepatology 41 2004) 38-43 Nutritional Management of End Stage Liver Disease Does the type of protein matter? Nutritional Management of End Stage Liver Disease Amino Acids in Encephalopathy Patients with advanced liver disease have an altered ratio of branched chain amino (leucine valine, isoleucine) acids to aromatic amino acids (phenylalanine, tyrosine) Aromatic amino acids are catabolised in the liver and their metabolism is impaired in cirrhosis resulting in an increase in circulating levels of AAAs Nutritional Management of End Stage Liver Disease Amino Acids in Encephalopathy Branched chain amino acids (BCAA) are metabolised predominantly in the skeletal muscle and fat Plasma BCAA levels fall due to their utilisation as an energy substrate and a substrate in gluconeogenesis Nutritional Management of End Stage Liver Disease Amino Acids in Encephalopathy The alteration in the ratio of BCAA:AAA has been proposed as an aetiological factor in the development of encephalopathy* *Fischer JE, Rosen HM, Ebeid AM et al. The effect of normalisation of plasma amino acids on hepatic encephalopathy in man. Surgery. 1976 Jul. 80 (1): 77-91. Nutritional Management of End Stage Liver Disease Amino Acids in Encephalopathy Marchesini et al carried out a multicentre double blind randomised trial in which BCAA supplementation was compared with an isocaloric casein supplementation in 64 patients with encephalopathy* *G Marchesini, FS Dioguardi, GP Bianchi et al. Long- term oral branched chain amino acid treatment in chronic hepatic encephalopathy. J of Hepatol, 1990; 11:92-101 Nutritional Management of End Stage Liver Disease 16/34 patients in the BCAA group regained normal mental state compared with 9/30 in the casein treated group (p<0.05) After 6 months on BCAA treatment nitrogen balance improved and was suggestive of decreased nitrogen catabolism in the BCAA treated group G Marchesini, FS Dioguardi, GP Bianchi et al. Long- term oral branched chain amino acid treatment in chronic hepatic encephalopathy. J of Hepatol, 1990; 11:92-101 Nutritional Management of End Stage Liver Disease Long-term oral BCAA supplementation(6 months) resulted in an increase in body weight G Marchesini, FS Dioguardi, GP Bianchi et al. Long- term oral branched chain amino acid treatment in chronic hepatic encephalopathy. J of Hepatol, 1990; 11:92-101 Nutritional Management of End Stage Liver Disease 15 centres over up to 15.5 months* 174 patients with Childs B or C cirrhosis *Marchesini G, Bianchi G, Merli M et al. Nutritional supplementation with branched chain amino acids in advanced cirrhosis: a double blind randomised trial. Gastroenterology 2003;124:1792-1801 Nutritional Management of End Stage Liver Disease Methods: Three types of nutritional supplements. Each 10g package supplied: 14.4g BCAA/day (leucine, isoleucine, valine and saccharose providing 37.5 kcal) 2.1g lacto-albumin/day (lacto-albumin, saccharose and mannitol providing 33.6 kcal) 2.4g maltodextrose/day (maltodextrose, saccharose providing 34.9 kcal) Nutritional Management of End Stage Liver Disease Methods: All subjects were instructed to take 2 packets three times daily dissolved in 200ml water half an hour before meals Patients were maintained on self selected diet. No new dietary restrictions were recommended or prescribed Standard therapies (albumin, diuretics, lactulose) were allowed but registered Nutritional Management of End Stage Liver Disease Results: 115 patients remained in the study 59 patients were withdrawn for a variety reasons: • Death • Deterioration in liver function • Non-compliance (palatability, nausea, gastrointestinal discomfort and diarrhoea) • Psychiatric disease Nutritional Management of End Stage Liver Disease Results: Patients treated with BCAAs were admitted to hospital less frequently: 195 days in BCAA group; 327days in L-ALB group and 520days in M-DXT group Length of stay varied within the treated groups: 0-24 days in BCAA group 0-31 days in the L-ALB group 0-77 days in the M-DXT group Nutritional Management of End Stage Liver Disease Results: Improved triceps skinfold thickness in the BCAA group Improved midarm fat area in the BCAA group Reduction in the prevalence and severity of ascites in the BCAA group Shift towards better scoring of health only in the BCAA group M-DXT supplementation therapy did not require increase in insulin therapy Nutritional Management of End Stage Liver Disease Results: Total bilirubin levels decreased in the BCAA group and increased in the M-DXT group Improvement in the CTP score in the BCAA group CTP was stable in the L-Alb group and M-DXT group Reduced prevalence of anorexia in the BCAA group Nutritional Management of End Stage Liver Disease To summarise: There are benefits to routinely supplement patients with advanced cirrhosis with branched chain amino acids Patient compliance Nutritional Management of End Stage Liver Disease Current Criteria for use of Oral BCAA Supplementation at RPAH: chronic encephalopathy frequent hospital admissions due to encephalopathy severe depletion of fat and muscle stores elevated blood sugar levels Nutritional Management of End Stage Liver Disease Does the timing or frequency of meals of meals matter? Nutritional Management of End Stage Liver Disease • Reduced glycogen storage capacity Nutritional Management of End Stage Liver Disease Eating Pattern Swart and Zillikens demonstrated that spreading food intake and inclusion of a late evening meal significantly improved nitrogen balance in cirrhotics* *Swart G, Zillikens M. Effect of a late evening meal on nitrogen balance in patients with cirrhosis of the liver Med J 1989;299: 1202-3 Nutritional Management of End Stage Liver Disease Eating Pattern A modified eating pattern should be recommended to all patients with ESLD. This would include eating at regular intervals – perhaps 5-7 small HP/HE meals/snacks per day Include a pre-bedtime HP/HE snack to provide substrate for the liver to work with during sleep (supplements) Ascites Patients with ascites usually have a high total body sodium but often have a low se sodium Generally have a poor intake secondary to abdominal distension Early Satiety Delayed gastric emptying Frequent snacking important to achieve high energy intake Ascites Sodium restricted diet. Most common restriction is a no added salt diet which can range between 50Mm Na and 100Mm Na Diuretics. Most commonly used are Lasix and Aldactone. Salt substitutes contraindicated due to potassium sparing effect of aldactone Ascites Fluid restriction Moderate (1500ml )to severe (≤ 800ml) ≤800ml used to treat intractable ascites unresponsive to diuretic therapy or when diuretic therapy no longer possible due to compromised renal function • Don’t measure: custards, ice cream Oesophageal Varices Varices can occur at any point along the GIT Oesophageal varices may bleed easily and bleeding further compromises the patient's nutritional status Oesophageal Varices Varices can occur at any point along the GIT Oesophageal varices may bleed easily and bleeding further compromises the patient's nutritional status Oesophageal Varices Following an oesophageal bleed the patient will be nil by mouth Varices will be banded Oral intake recommenced when patient’s condition stabilises Oesophageal Varices When allowed to eat patients should be advise to: Eat carefully and avoid large bolus of food which might dislodge a clot Avoid over distension of the stomach which might lead to regurgitation or vomiting Avoid foods with sharp bones that might be accidentally swallowed Diabetes in Liver Disease Patients with ESLD may present with impaired glucose tolerance. This may be due to a number of factors: Depleted hepatic glycogen stores Impaired glucose tolerance Hyperinsulinaemia Insulin resistance Diabetes in Liver Disease Management involves diabetic education without restriction of energy intake Insulin therapy BCAA supplementation has been shown to facilitate control of blood sugar levels in patients with ESLD Nutritional Management of End Stage Liver Disease Achieve and maintain high energy intake(35-40 non protein kcal/kg/day) Achieve and maintain a high protein intake(1.0-1.5g/kg/day) Avoid unnecessary fat restriction Encourage frequent snacking Nutritional Management of End Stage Liver Disease Restrict dietary sodium intake in the presence of ascites and/or oedema Restrict fluid intake to assist in the management of ascites/oedema associated with hyponatraemia Nutritional Management of End Stage Liver Disease Consider branched chain amino acid supplementation Significant pre-bedtime snack Nutritional Response to Hepatic Transplantation Hepatotoxicity of Herbal Remedies Herbs are potent medicines The community is increasingly seeking out alternative or “natural” therapies Patients with hepatitis C frequently seek out alternative therapies Hepatotoxicity of Herbal Remedies Important to be aware of the possible harmful effects of herbs Some herbs are hepatotoxic and patients with known liver disease should avoid using them Nutritional Management of NAFLD Treatment centres around reducing insulin resistance Dietary intervention Increased physical activity Metformin Nutritional Management of NAFLD Weight loss strategies in presence of overweight/obesity. Weight loss results in improved lipid and carbohydrate metabolism. Weight loss must be slow. Rapid weight loss results in worsening liver function tests and hepatomegaly Rapid weight loss may promote or worsen NAFLD, NASH and may result in liver failure Nutritional Management of NAFLD • Normal weight subjects: dietary and pharmacological treatment of altered lipid and /or carbohydrate metabolism • In overweight individuals with elevated aminotransferase levels weight loss of 10% or more corrects aminotransferase levels and decreases hepatomegaly Nutritional Management of NAFLD Modification in lifestyle which involves weight reduction and regular exercise are the mainstay of treatment and prevention of NAFLD Nutritional Management of NAFLD Summary There is no quick fix and there are no gimmicks for the consumer – Weight control – Increased exercise/physical activity – Good Diabetic control – Manage lipid abnormalities