Digestive enzymes and stomach acid: Why they matter
Healthy digestion is the foundation of good health, yet many people overlook the essential role that digestive enzymes and stomach acid play in breaking down food and absorbing nutrients.
From proteins and fats to carbohydrates, digestive enzymes work alongside hydrochloric acid (HCl) to support efficient digestion, nourish the gut and maximise nutrient absorption.
When this process is compromised, symptoms such as bloating, indigestion and food sensitivities may become more common, making it important to understand how these remarkable digestive compounds work.
Common signs of impaired digestion may include:
- Bloating
- Excessive gas or flatulence
- Belching
- Nausea
- Bad breath
- Food sensitivities
- Changes in bowel habits
- General digestive discomfort
The importance of hydrochloric acid (HCl)
Hydrochloric acid (HCl), produced naturally in the stomach, is essential for healthy digestion. It helps create an environment that discourages harmful bacteria and other pathogens, activates the digestive enzyme pepsin to begin protein digestion, and stimulates the release of pancreatic digestive enzymes further along the digestive tract.
Adequate stomach acid also supports the absorption of important nutrients, including iron, calcium and vitamin B12.
Could you be low in protein?
Poor protein digestion or inadequate protein intake can contribute to a range of health concerns. Early signs may include:
- Brittle nails or poor nail growth
- Dry skin or thinning hair
- Low blood pressure
- Reduced immune function
- Poor digestion
- Loss of muscle tone or strength
- Fluid retention
- Slower recovery from illness or injury
Optimising digestive function is an important first step towards improving nutrient absorption and supporting overall health and wellbeing.
What do enzymes do?
| Enzyme | Primary role in the body |
|---|---|
| Amylase (pancreas and saliva) | Breaks down carbohydrates into simpler sugars such as maltose. Salivary amylase begins carbohydrate digestion in the mouth, while pancreatic amylase continues the process in the small intestine. |
| Protease (pancreas) | Breaks down proteins into amino acids for absorption. Adequate protein digestion also supports a healthy intestinal environment by helping control unwanted microorganisms, including parasites, yeast and certain bacteria. |
| Lipase (pancreas) | Breaks down dietary fats into fatty acids and glycerol, allowing fats and fat-soluble vitamins (A, D, E and K) to be absorbed. |
| Pancreatin (pancreas) | A blend of digestive enzymes including amylase, protease and lipase that assists the digestion of carbohydrates, proteins and fats within the small intestine. |
| Bromelain (pineapple) | A natural enzyme extracted from pineapple that assists with protein digestion. |
| Papain (papaya) | A proteolytic enzyme extracted from papaya that supports the breakdown of dietary proteins. |
| Lactase (small intestine) | Breaks down lactose, the natural sugar found in milk and dairy products, into glucose and galactose. |
| Pepsin (stomach) | A protein-digesting enzyme that begins the breakdown of proteins into smaller peptides. Pepsin is only activated in the presence of adequate hydrochloric acid (HCl). |
| Hydrochloric acid (HCl) (stomach) | Creates the acidic environment required for protein digestion, activates pepsin, stimulates pancreatic enzyme secretion, assists mineral absorption (including iron and vitamin B12), and helps protect against harmful bacteria and parasites entering through food. |
Possible signs associated with low hydrochloric acid (HCl)
| Digestive symptoms | Possible nutritional and health effects |
|---|---|
| Bloating | Reduced absorption of iron, folate and vitamin B12 |
| Belching | Anaemia |
| Flatulence | Peeling or cracked fingernails |
| Nausea | Food sensitivities |
| Indigestion | Altered gut microbiota (dysbiosis) |
| Feeling unusually full after meals | Increased susceptibility to intestinal parasites |
| Constipation | Poor protein digestion |
| Diarrhoea | Undigested food appearing in stools |
The bottom line
Digestive enzymes and hydrochloric acid play a fundamental role in breaking down food, absorbing nutrients and supporting overall digestive health. While occasional bloating or indigestion is common, persistent digestive symptoms shouldn’t be ignored. Understanding how your digestive system works is the first step towards identifying potential nutritional gaps and creating a plan that supports long-term wellbeing.
If you’re experiencing ongoing digestive discomfort, nutrient deficiencies or simply want to optimise your health through food, personalised nutrition advice can make all the difference. Rather than relying on guesswork, an individual assessment can help uncover the underlying factors affecting your digestion and develop a practical, evidence-informed approach tailored to your needs.
Ready to improve your digestive health?
Book a one-on-one nutrition consultation with Chef Sam Gowing and receive personalised dietary advice, practical meal strategies and professional guidance to help support your digestive health and overall wellbeing.
Book your initial nutrition consultation
Whether you’re managing digestive concerns, food intolerances or simply want to feel your best, I’m here to help you make confident, sustainable changes through the power of food.
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