What Makes Your Pulse Speed Up After Eating

What It Means when Pulse Speeds After Eating

Dr. Arthur Coca discovered that an increase in pulse rate after eating indicates an allergic response. Allergies often begin long before obvious symptoms appear, as the body gradually prepares to react to certain substances (allergens). This process commonly starts in early childhood. Over time, changes in the intestinal environment can develop without being noticed, as they occur slowly and persist for years. When these changes become significant, the body responds more strongly, including reactions that involve an increased pulse rate.

What Causes Allergies

Low stomach acid, pancreatic insufficiency, and liver congestion are key causes of allergic reactions. Low stomach acid and pancreatic insufficiency lead to poor digestion of macronutrients, such as carbohydrates, fats, and proteins. When large molecules remain undigested in the gut, they create a substrate for dysbiosis, or an imbalance in the gut microbiome. Over time, the villi, which are the absorptive surfaces of the intestine, become irritated. Damage to the villi can lead to increased intestinal permeability, or “leaky gut,” allowing large molecules to enter the bloodstream. In response, the body produces antibodies, particularly IgA, which recognize these molecules as foreign, triggering an allergic reaction.

The second layer of defense is the liver. The liver filters the blood, identifying and removing foreign substances from the body. However, if the liver is not functioning properly, it cannot fully eliminate these substances. When foreign molecules remain in the body, they can enter other tissues, triggering allergic reactions.

Personal Experience

I remember one day in 2024 or 2025, my niece complained that her face was red. I told her it was probably an allergic reaction, maybe from something she put on her face, and that it would likely subside if she avoided the product. A little later, she said her pulse felt very fast. We checked it with a digital blood pressure monitor that also measures pulse. Her pulse was indeed very high—around 140 beats per minute, while normal is 60–100 bpm.

We tried to figure out the cause. She had eaten fish about 3–4 hours earlier, and she had also given something to the dog, which vomited a few minutes later. This made us suspect that the food might be causing her red face and fast pulse. Unfortunately, she did not vomit herself, so it was likely that some toxins from the food had entered her bloodstream, causing these symptoms.

I gave her two tablespoons of activated charcoal in a glass of water to help bind the toxins. She drank it, but still did not vomit. We decided to go to the doctor. The doctor gave her a single pill and instructed her to eat a large meal to induce vomiting. Luckily, she vomited along with the activated charcoal. She forgot the name of the pill, but it was just a single dose. She was feeling well within just a few days.

Lesson

A fast pulse after eating is not only caused by allergies related to chronic dysbiosis—it can also result directly from foodborne intoxication. You can often tell if it is linked to something you just ate because the signs and symptoms typically appear within four hours or less, as discussed in my Functional Nutrition book.

If it is not foodborne intoxication, allergic reactions usually occur in a more chronic pattern rather than as a one-time event. Therefore, the best approach is to address underlying issues such as low stomach acid, pancreatic insufficiency, and liver function, rather than relying solely on activated charcoal.