Food Allergy vs Food Intolerance vs Food Sensitivity: What's the Difference?

Understanding food reactions and exploring a personalised approach to improving food tolerance

Have you ever noticed that certain foods leave you feeling bloated, tired, uncomfortable or simply not yourself?

Food-related symptoms can be frustrating, particularly when you struggle to identify which foods are responsible. Some reactions happen almost immediately, while others appear hours later, making it difficult to recognise a consistent pattern.

Terms such as food allergy, food intolerance and food sensitivity are frequently used interchangeably, but they describe different types of reactions.

At Conscious Nutrition in Manchester, I work with clients experiencing digestive discomfort, skin problems, fatigue and other persistent symptoms who suspect that particular foods may be contributing to their health concerns.

Understanding the different types of food reactions is an important starting point.

What Is a Food Allergy?

A food allergy involves the immune system reacting to a particular food protein.

In an immediate, IgE-mediated allergy, the immune system mistakenly identifies a normally harmless substance as a threat, triggering an allergic response.

Symptoms may include:

• Itching, hives or skin rashes

• Swelling of the lips, tongue or throat

• Digestive discomfort, nausea or vomiting

• Wheezing or breathing difficulties

• In severe cases, anaphylaxis

Common allergens include peanuts, tree nuts, eggs, milk, wheat, fish, shellfish and soya.

Food allergies can be serious and require appropriate medical assessment. Conventional investigations may include skin-prick testing or specific IgE blood tests, interpreted alongside clinical history.

What Is a Food Intolerance?

Food intolerance differs from an immediate food allergy because it generally does not involve the same IgE-mediated immune response.

Instead, symptoms may arise when the digestive system has difficulty processing particular food components.

Lactose intolerance is a familiar example. When the body produces insufficient lactase, the enzyme responsible for breaking down lactose, consuming dairy products containing lactose can lead to digestive symptoms.

Common symptoms include:

• Bloating and excessive gas

• Abdominal discomfort or cramping

• Diarrhoea or altered bowel habits

• Nausea

• Digestive heaviness after meals

Some intolerances are dose-dependent, meaning a small amount of a food may be tolerated while larger quantities cause symptoms.

This distinction matters because permanent avoidance isn't always necessary.

What Is a Food Sensitivity?

Food sensitivity is a broader, less precisely defined term commonly used when someone experiences symptoms they associate with particular foods.

These may include digestive discomfort, headaches, fatigue or changes in skin condition.

However, the relationship between food and symptoms isn't always straightforward.

Digestive function, stress, meal composition, the quantity consumed and underlying gastrointestinal conditions can all influence how someone responds to food.

This is why I prefer to consider the wider health picture rather than simply recommending increasingly restrictive diets.

Why Can Food Reactions Be Difficult to Identify?

One of the biggest challenges is that symptoms can be inconsistent.

You may tolerate a particular food on one occasion but experience discomfort after eating it another time.

Several factors may contribute:

Portion size: Some people tolerate small quantities of certain carbohydrates but develop symptoms when consuming larger amounts.

Food combinations: Eating several fermentable ingredients together may produce symptoms that wouldn't occur with individual foods.

Digestive function: Conditions such as IBS, coeliac disease and lactose intolerance can influence how well certain foods are tolerated.

Stress and the nervous system: The gut and brain communicate continuously, and stress can influence gastrointestinal motility and sensitivity.

The gut microbiome: Intestinal microorganisms play an important role in digestion and fermentation, potentially influencing symptoms such as bloating and gas.

Understanding these factors can help explain why simply avoiding a growing list of foods doesn't always provide lasting relief.

How Rayonex Bioresonance Is Used to Explore Food Allergies and Intolerances

At Conscious Nutrition, I use the Rayonex bioresonance system, based on Bioresonance According to Paul Schmidt, as an important part of my approach to investigating food-related symptoms.

The method is based on the principle that different substances and biological processes are associated with specific energetic frequencies. Through energetic testing, the Rayonex system is used to assess potential disturbances associated with foods, environmental substances and other factors that may be placing stress on the body.

This approach allows me to explore a wide range of potential food-related sensitivities, rather than focusing solely on the foods a client already suspects.

For example, someone experiencing persistent bloating, fatigue or skin irritation may have noticed reactions to dairy or wheat, but there may be other dietary or environmental factors worth considering.

Rayonex describes this approach as a way of identifying energetic responses associated with allergies and intolerances. In my practice, I use these findings alongside a detailed health history, nutritional assessment and the client's individual symptoms to help guide a personalised programme.

Bioresonance Therapy and Food Desensitisation

One of the key applications of Bioresonance According to Paul Schmidt is its use in supporting the body's response to substances that appear to trigger unwanted reactions.

Bioresonance therapy aims to harmonise energetic disturbances associated with particular foods and other substances, with the intention of supporting a more balanced response. This process is known as energetic desensitisation.

In practice, this may involve 2 to 3 sessions of bioresonance therapy alongside temporary dietary adjustments, nutritional support and a carefully structured reintroduction plan where appropriate.

Rather than viewing every food reaction in isolation, I also consider digestive function, nutritional status, lifestyle factors and possible environmental influences.

My aim is to work towards improved food tolerance and a more varied, sustainable diet wherever possible, rather than encouraging unnecessary long-term food restrictions.

Should You Have a Food Intolerance Test?

There are several different approaches to investigating suspected food reactions, but they don't all measure the same thing.

For severe food allergies, established medical allergy investigations are important (e.g. peanut allergy)

For certain intolerances, recognised investigations may be appropriate. Examples include hydrogen breath testing for lactose malabsorption and blood tests for coeliac disease.

Commercial food-specific IgG panels, for example, are not considered reliable diagnostic tests for food intolerance or allergy.

Can You Reintroduce Foods You've Previously Avoided?

In many cases, the goal is not permanent restriction.

Where a food intolerance is suspected, a structured elimination period alongisde energetic desensitations followed by gradual reintroduction may help determine whether symptoms improve when a food is removed and return when it is reintroduced.

It may also help establish how much of a particular food can be comfortably tolerated.

This is especially relevant for people who have gradually reduced the variety of foods they eat because of persistent digestive symptoms.

However, foods associated with confirmed allergies or potentially serious reactions should not be reintroduced without appropriate medical guidance.

A Personalised Approach to Food Intolerances in Manchester

If you've been struggling with bloating, digestive discomfort or unexplained symptoms after eating, it can be tempting to keep removing foods from your diet.

However, a more useful starting point is often to understand why those symptoms may be occurring.

At Conscious Nutrition, my approach combines nutritional therapy, individual assessment and Rayonex Bioresonance therapy to explore potential contributing factors and develop a plan suited to your circumstances.

Find out more about Food Allergies & Intolerances in Manchester.

Alternatively, if you're unsure whether an appointment would be suitable, you can book a free discovery call to discuss your concerns.