Acid Reflux, GERD, and Heartburn: Foods to Avoid + Diet Tips

Burning in your chest after meals. A sour taste creeping into your throat. Symptoms that seem worse after coffee, wine, chocolate, or lying down at night.

What’s covered in this guide

What is acid reflux?
Acid reflux diet: what foods may trigger heartburn?
Why is heartburn often worse at night?
Is acid reflux always caused by too much stomach acid?
Heartburn natural remedies: what may help support reflux?
What about PPIs and antacids?
How to manage reflux in babies
How nutritional therapy may support acid reflux
When should reflux be medically assessed?

If this sounds familiar, you are not alone.

Around 1 in 7 adults worldwide experience reflux symptoms, and Gastroesophageal Reflux Disease, often called acid reflux or chronic heartburn, is now one of the most common digestive complaints worldwide.

And despite what many people believe, reflux is not always simply about “too much stomach acid”.

Food choices, eating habits, stress, body position, digestive function, medication use, and even sleep may all play a role.

In this guide, I’ll walk you through what acid reflux really is, which foods may trigger symptoms, what to know about PPIs and antacids, natural ways to support reflux, and practical tips for babies with reflux.

What is acid reflux?

Acid reflux happens when stomach contents move back up into the oesophagus, the tube connecting your mouth and stomach.

This may cause symptoms such as:

• burning in the chest
• throat irritation
• frequent burping
• bloating after meals
• a sour or bitter taste in the mouth
• chronic coughing
• hoarseness
• symptoms that feel worse when lying down

When reflux becomes frequent or persistent, it may be diagnosed as GERD (Gastroesophageal Reflux Disease).

At the centre of this is a small muscular valve called the lower oesophageal sphincter (LES).

Its job is simple:

Food goes down. Stomach contents stay down.

When that valve relaxes at the wrong time, reflux can occur even when stomach acid production is completely normal.

Acid reflux diet: what foods may trigger heartburn?

One of the most common searches online is:

“What foods should I avoid with acid reflux?”

There is no universal reflux diet.

But certain foods may relax the lower oesophageal sphincter, delay stomach emptying, increase pressure in the stomach, or irritate an already sensitive oesophagus.

Common food triggers may include:

☕ Coffee and high caffeine intake
🥤 Carbonated drinks and soda
🍫 Chocolate, particularly high cacao chocolate
🌿 Peppermint and mint teas
🍋 Citrus fruits such as lemon, lime, orange, and grapefruit
🍅 Tomato-based sauces and concentrated tomato products
🍷 Alcohol, especially wine
🍟 Fried or very high-fat meals
🌶 Very spicy foods
🧅 Onion and garlic in sensitive individuals
🍬 Artificial sweeteners in some people

What about vinegar?

For some people, vinegar is tolerated perfectly well.

For others, especially when the oesophagus is already irritated, it may aggravate symptoms.

This is why personalised trigger identification often works better than blanket food elimination.

Why is heartburn often worse at night?

Another very common question is:

“Why is my acid reflux worse at night?”

Several factors may contribute:

• large evening meals
• eating too close to bedtime
• alcohol with dinner
• lying flat too soon after eating
• tight clothing
• excess abdominal pressure
• poor sleep
• chronic stress

Even simple changes like finishing dinner earlier or staying upright after meals may make a noticeable difference.

Is acid reflux always caused by too much stomach acid?

Not necessarily. In some individuals, reflux may be linked to:

• bloating after meals
• delayed gastric emptying
• excess abdominal pressure
• bacterial fermentation
• digestive dysfunction
• Small Intestinal Bacterial Overgrowth
• Helicobacter pylori Infection
• hiatus hernia
• food intolerances
• functional dyspepsia

Some emerging evidence suggests that altered digestion, bacterial overgrowth, and increased intra-abdominal pressure may contribute to reflux symptoms in certain individuals.

In other words, reflux is often more complex than simply “too much acid”.

Heartburn natural remedies: what may help support reflux?

Another high-volume search is:

“Heartburn natural remedies”

Natural support is not about chasing quick fixes.

It is about understanding what may be driving symptoms in the first place.

Practical strategies that may support reflux include:

• identifying personal food triggers
• eating smaller meals
• slowing down and chewing properly
• avoiding large meals late at night
• staying upright after meals
• reviewing caffeine intake
• reducing alcohol where relevant
• managing stress and nervous system load
• supporting healthy body composition where appropriate
• exploring bloating, food intolerance, or digestive symptoms beyond reflux

Sleep and digestion are closely connected. If reflux tends to worsen at night, you may also enjoy my practical summary of Why We Sleep and simple ways to support deeper recovery.

Because in many cases, reflux is not just a stomach issue.

It may also be a digestion, stress, lifestyle, and recovery issue.

What about PPIs and antacids?

Many people with reflux are prescribed acid-suppressing medications known as proton pump inhibitors (PPIs), such as:

• Omeprazole
• Esomeprazole
• Pantoprazole

These medications can provide important symptom relief and may be clinically necessary in some situations.

However, long-term use should always be reviewed with your doctor.

Why?

Because stomach acid does far more than simply “sit in the stomach”.

Healthy stomach acid helps:

• activate pepsin, an enzyme needed for protein digestion
• support digestion of protein-rich and fat-containing meals
• support absorption of nutrients such as iron and vitamin B12
• help maintain a healthy microbial balance in the digestive tract
• act as part of your body’s natural defence against unwanted microbes

Long-term PPI use has been associated with:

• lower vitamin B12 absorption
• lower magnesium levels
• reduced calcium absorption
• changes in gut microbiota
• increased risk of bacterial overgrowth
• increased risk of certain gut infections

Some of these associations, including changes in nutrient absorption and gut microbial balance, are discussed in the reflux literature you shared.

Never stop prescribed medication without medical guidance.

Long-term acid suppression may affect nutrient absorption in some individuals, particularly vitamin B12, magnesium, iron, and calcium. I’ve also written about how to choose high-quality supplements in Spain and across Europe.

How to manage reflux in babies

Mild reflux or spit-up is very common in healthy babies and often improves naturally as the digestive system matures.

Simple feeding and positioning strategies may help support comfort:

• feeding in a more upright position
• keeping your baby upright for 20 to 30 minutes after feeds
• offering smaller, more frequent feeds where appropriate
• burping gently during and after feeds
• paced bottle feeding where relevant
• reducing swallowed air during feeding

In some babies, feeding technique, overfeeding, or sensitivity to cow’s milk protein may also play a role.

If reflux affects feeding, sleep, weight gain, or causes significant distress, always speak with your paediatrician.

How nutritional therapy may support acid reflux

I don’t look at reflux as simply a food problem.

I look at the bigger picture.

This may include:

• meal timing
• portion sizes
• eating speed
• chewing habits
• stress and nervous system regulation
• bloating after meals
• sleep quality
• caffeine intake
• alcohol habits
• medication history
• possible nutrient deficiencies
• digestive symptoms beyond reflux

Because in many cases, reflux is not just about what you eat.

It may also be about how you eat, how you live, and how well your digestive system is coping.

When should reflux be medically assessed?

Persistent reflux should always be discussed with a healthcare professional, especially if you experience:

difficulty swallowing
unexplained weight loss
vomiting
anaemia
black stools
persistent chest pain

Need support with reflux, bloating, or digestive discomfort?

If acid reflux, heartburn, bloating, or digestive discomfort is affecting your energy, sleep, confidence, or quality of life, nutritional therapy may help you better understand your triggers and support your digestive health.

I work with individuals, couples, parents, children, and families in Barcelona and online, supporting a wide range of digestive, metabolic, and lifestyle-related health concerns.

Book a free 15-minute call or message me directly on WhatsApp.

FAQ

What foods should I avoid with acid reflux or heartburn?

Common triggers may include coffee, carbonated drinks, chocolate, peppermint, citrus fruits, tomato-based sauces, alcohol, fried foods, and very large meals. Triggers are highly individual, so keeping a simple food and symptom journal can often be more useful than following a strict elimination diet.

Is acid reflux always caused by too much stomach acid?

Not necessarily. Acid reflux often involves dysfunction of the lower oesophageal sphincter, the muscular valve between the oesophagus and stomach. Factors such as bloating, excess abdominal pressure, delayed gastric emptying, stress, food triggers, or digestive dysfunction may also play a role.

Can coffee make acid reflux worse?

For some people, yes. Coffee may relax the lower oesophageal sphincter and increase reflux symptoms, especially when consumed on an empty stomach, in large amounts, or later in the day. Some people tolerate small amounts perfectly well, while others notice a clear trigger.

Are PPIs such as omeprazole safe long term?

Proton pump inhibitors such as omeprazole may be clinically important and provide effective symptom relief. However, long-term use should always be reviewed with your doctor, as prolonged acid suppression has been associated with changes in nutrient absorption, gut microbiota, and bacterial overgrowth in some individuals.

Why is stomach acid important for digestion?

Healthy stomach acid helps activate pepsin, an enzyme needed for protein digestion. It also supports the digestion of protein-rich and fat-containing meals, helps release nutrients such as iron and vitamin B12 from food, and acts as part of the body's natural defence against unwanted microbes.

Why is my heartburn worse at night?

Heartburn often feels worse at night because lying flat makes it easier for stomach contents to move upward. Eating large evening meals, drinking alcohol, late-night snacking, stress, and going to bed too soon after eating may all contribute.

Can nutritional therapy support acid reflux?

Nutritional therapy may help identify food triggers, eating habits, lifestyle factors, stress patterns, digestive symptoms, and nutrient gaps that may be contributing to reflux. The goal is not simply symptom suppression, but understanding the bigger picture behind digestive health.

How can I manage reflux in babies naturally?

Mild reflux or spit-up is very common in babies and often improves naturally with time. Feeding in a more upright position, smaller and more frequent feeds, paced bottle feeding, and keeping babies upright after feeds may help. If reflux affects feeding, weight gain, sleep, or causes significant distress, always speak with your paediatrician.

View scientific references

Fass, R., Boeckxstaens, G. E., El-Serag, H., Rosen, R., Sifrim, D., & Vaezi, M. F. (2021). Gastro-oesophageal reflux disease. Nature Reviews Disease Primers, 7(1), 55.

Mahajan, R., Kulkarni, R., & Stoopler, E. T. (2023). Gastroesophageal reflux disease and oral health: A narrative review. Special Care in Dentistry, 43(2), 123–131.

Sharma, P., & Yadlapati, R. (2021). Pathophysiology and treatment options for gastroesophageal reflux disease: Looking beyond acid. Annals of the New York Academy of Sciences, 1486(1), 3–14.

Surdea-Blaga, T., Negrutiu, D. E., Palage, M., & Dumitrascu, D. L. (2017). Food and gastroesophageal reflux disease. Current Medicinal Chemistry, 26(19), 3497–3511.