What Frank Suárez taught about coffee, the nervous system, and metabolism

Coffee has long been a source of confusion. For some people, it's a daily aid: it keeps them awake, stimulates their minds, reduces hunger, and provides that sense of alertness they seek in the morning or during work. For others, however, coffee doesn't go down so well. They may like the taste, but their body doesn't necessarily tolerate it the same way.

In Frank Suárez's teachings, the important point was not simply to say that coffee is "good" or "bad." The key was to observe how the body reacts, understand each person's nervous system type, and look at what research has found regarding coffee consumption.

Because in metabolism, as Frank often taught, not everyone responds the same way. The body is alive, it has its balances, and what helps one person can affect another if their body is moving in a different direction.

Coffee, caffeine, and the stimulating effect

Frank Suárez explained that coffee contains caffeine, and caffeine is a stimulant. That's why many people use it to stay awake, study, work, or feel more alert.

This stimulating effect also explains why some people lose their appetite when they drink coffee. Caffeine activates the body, awakens the mind, and can make a person feel less sleepy for a while.

But right there begins the important part of the teaching: coffee does not act on an empty body, nor on a body identical to everyone else's. It acts on an organism that already has an internal condition, a predominant type of nervous system, and a particular balance.

That's why Frank didn't teach coffee as a universal rule. He explained it within a broader concept: the excited nervous system and the passive nervous system.

Excited nervous system and passive nervous system

One of Frank's central observations was that people can have a predominance of a more excited or more passive nervous system.

People with an excited nervous system tend to have slightly more alkaline blood. People with a passive nervous system tend to have slightly more acidic blood. Frank clarified that this doesn't mean the "whole body" is acidic or alkaline, because the body has parts that need acidity and parts that need alkalinity.

The stomach, for example, needs acid for digestion. Blood, on the other hand, needs to remain more alkaline than acidic. So simply saying that "the body is too acidic" was not, for Frank, a correct way to explain it. The problem appears when there is an excess of accumulated acidity in the tissues or in the blood.

From this perspective, coffee acts as an acidifying substance. That is, it tends to shift the balance towards more acidity. And that's where it becomes clear why some people feel better with coffee and others don't.

Why coffee may appeal more to people with an excited nervous system

Frank observed that people with an excited nervous system tend to be more attracted to coffee. The reason he gave was simple: since these people tend to be more alkaline, the acidifying effect of coffee can bring them closer to a point of better balance.

When that balance improves, oxygenation can also improve. And when more oxygen is available, the person can feel more energy, better mental function, and a general sense of well-being.

That's why Frank said that if a survey were conducted in places where people frequently seek coffee, a large number of people with an excited nervous system would probably be found. It wouldn't be a coincidence. Their bodies ask for something that, in many cases, helps them feel better.

Here the teaching is not to drink coffee out of fashion, nor to reject it out of fear. The teaching is to observe: what effect does it have on the body? Does it pleasantly increase energy? Does the person feel better? Or does the body react with stress?

Why people with a passive nervous system should be more careful

In the case of people with a passive nervous system, Frank explained that the matter can be different.

If a passive person already tends to have slightly more acidic blood, and also abuses coffee, they can push their body further towards that acidity. In that case, instead of feeling better, they might not feel so good.

Frank didn't say that a person with a passive nervous system couldn't drink coffee. The teaching was not to abuse it. The problem wasn't necessarily drinking it, but going in a direction that wasn't good for the body.

This is an important distinction. Many times people look for an absolute answer: "Is coffee good or bad?" But Frank looked at the body by types, by reactions, and by balance. For one person it can be a help. For another it can be a burden.

What studies on coffee and mortality showed

Frank also shared information from research he considered important. For him, when something is scientifically proven through organized clinical studies, it is worth observing.

One of the studies he mentioned was published in Annals of Internal Medicine in 2008. It was led by Dr. López-García along with other scientists from Harvard University. This study observed 41,736 men for 18 years and 86,214 women for 24 years.

According to Frank, the results found an inverse relationship between coffee consumption and certain problems such as heart attacks, cardiovascular problems, cancer, and diabetes. An inverse relationship means that those who consumed coffee had fewer of these problems compared to other groups.

Frank clarified that it was not a dramatic difference, but a consistent trend. By observing more than 130,000 people for an average of about 20 years, the study found that coffee consumption, for the vast majority of people, had a beneficial effect.

He then mentioned another study published in The New England Journal of Medicine, led by Dr. Freedman. This study observed more than 400,000 people for 14 years and confirmed a similar trend: coffee consumption was associated with a reduction in overall mortality, with cardiovascular reduction, a small reduction related to cancer, and also benefits related to diabetes.

For Frank, these results made sense with what he had observed in practice.

Why these results made sense to Frank

Frank explained that, in his observations within NaturalSlim, approximately 65% of the population had an excited nervous system, while about 35% had a passive nervous system.

If most people are on the excited side, then the acidifying effect of coffee could benefit many of them by helping to shift the pH balance towards a more favorable point. From that perspective, it would make sense that large studies would find a beneficial trend in most coffee consumers.

The idea was not that coffee was a magic solution. The idea was that, in many people, especially those with an excited nervous system, coffee could better fit their internal balance.

But then Frank returned to the practical point: even if there is good news for the majority, each person has to see how their own body responds.

Coffee doesn't suit everyone

Frank shared his own case as an example. He said that his body did not tolerate coffee well. He liked it, but his body didn't.

How did he know? Because he measured it with a glucometer. When he drank coffee, his glucose spiked. For him, that was a sign that coffee was stressing his body.

For that reason, he switched to green tea.

He also compared his case with his wife's. She drank coffee and her glucose didn't rise. However, when he drank coffee with her, his glucose did rise. This indicated to him that, in his particular case, being of the passive nervous system type, coffee was not well tolerated.

This observation is very important because it grounds the entire teaching. Although studies may show general benefits, and although many people with an excited nervous system may feel good with coffee, that does not replace personal observation.

The body speaks. Sometimes it speaks with energy. Sometimes it speaks with sleepiness. Sometimes it speaks with hunger. And sometimes it speaks with elevated glucose.

Glucose as a sign of body stress

One of the practical ways Frank used to observe the reaction to coffee was to measure glucose.

If a person drinks coffee and their glucose rises, that can indicate that coffee is stressing the body. In that case, even if the person likes coffee or has heard that it has benefits, their body is giving another signal.

For Frank, this was part of the cause-and-effect approach. It wasn't about defending an idea out of habit. It was about observing what happens in the person's actual body.

Coffee can help some and not help others. The difference lies in the individual response, especially when considering the type of nervous system and the glucose reaction.

The practical teaching: coffee yes, but with knowledge

Frank's message about coffee was positive for most, but not irresponsible.

For people with an excited nervous system, coffee could be beneficial, and the body often craves it because it feels better with it. For people with a passive nervous system, the recommendation was not to abuse it, because it can move the body in a less convenient direction.

And for anyone, the key point was to observe tolerance. If coffee raises glucose, it may be stressing the body. If it doesn't raise it and the person feels good, it could be a sign that their body handles it better.

Frank did not teach to copy what others do. He taught to understand one's own body.

Conclusion: coffee is not understood by opinions, it is understood by observing the body

Coffee has had many opinions around it: whether it's harmful, whether it helps, whether it should be decaffeinated, whether it's good or not good. Frank Suárez proposed looking at the issue with more knowledge.

Coffee contains caffeine, stimulates the body, and has an acidifying effect. This can especially benefit many people with an excited nervous system, because it helps them get closer to a better balance. In addition, large studies observed a favorable relationship between coffee consumption and lower mortality, including cardiovascular and diabetes-related benefits.

But the teaching doesn't end there. Each person's body has the last word. A person can love coffee and still have their body not tolerate it well. Another can drink it and feel better. That's why Frank insisted on observing, measuring when necessary, and not abusing it when the body doesn't respond well.

In the end, coffee is not simply a beverage. It is a tool that can help or stress, depending on the body that receives it. And there is the true lesson: knowledge allows one to stop living by opinions and begin to understand the signals of metabolism.

Because, as Frank taught, the truth always triumphs.