ALFA NUTRICIÓN Y FITNESS
Otay Universidad, Tijuana, Baja California
Specialized care for patients in Tijuana, San Diego, and surrounding areas
The Problem Is Not Just the Diet
“I’ve tried so many diets, and I always end up gaining the weight back.”
This phrase is becoming increasingly common among people who want to improve their health, lose body fat, gain muscle mass, or manage metabolic conditions.
We live in an environment where hundreds of diets, apps, supplements, meal programs, and recommendations are available online. However, having more information does not necessarily mean achieving better results.
The magnitude of the excess-weight problem helps us understand why this topic is so important. In the United States, the most recent data from the National Center for Health Statistics estimate that 40.3% of adults aged 20 and older had obesity during 2021–2023, while another 31.7% were overweight. In California, the CDC’s adult obesity map reported a prevalence of 29.1% in 2024.
These figures do not represent merely an aesthetic problem. Excess body fat is associated with a higher risk of type 2 diabetes, hypertension, cardiovascular disease, fatty liver disease, and other metabolic complications.
In this context, the right question is not simply:
“What diet should I follow?”
Instead, we should ask:
“What nutritional strategy can I follow safely, realistically, and sustainably according to my body, health, and lifestyle?”
This is where personalized nutrition becomes important.
Why Do Some Diets Stop Working?
First, we need to clarify something: diets can work.
Different dietary patterns can produce weight loss when they create an appropriate energy deficit. The problem is that no single diet is universally superior for everyone.
A review of 48 randomized clinical trials found that different low-carbohydrate and low-fat diets produced significant weight loss, but the differences between specific diets were relatively small. The authors concluded that a strategy a person can maintain may be more important than choosing a “perfect” diet.
Therefore, when someone says, “This diet didn’t work,” we need to analyze what actually happened.
There may have been:
- Excessive restriction.
- Constant hunger.
- Lack of variety.
- Unrealistic goals.
- Lack of follow-up.
- Schedules that were incompatible with the plan.
- Difficulty eating outside the home.
- Lack of physical activity.
- High levels of stress.
- Insufficient sleep.
- Expectations of excessively rapid results.
- Lack of strategies for maintaining the weight that was lost.
The problem is not necessarily the diet itself. Many times, it is the lack of adaptation of the diet to the individual.
What Does Personalized Nutrition Mean?
Personalized nutrition consists of adapting the nutritional intervention to each patient’s characteristics, needs, goals, health conditions, preferences, and personal context.
It does not simply mean replacing one meal with another.
It means analyzing the complete picture.
For example, two people may have the same body weight and yet have significant differences in:
- Body fat percentage.
- Muscle mass.
- Visceral fat.
- Physical activity.
- Metabolism.
- Work schedules.
- Sleep quality.
- Family history.
- Medications.
- Food preferences.
- Athletic goals.
- Metabolic conditions.
For this reason, giving exactly the same personalized meal plans to everyone would not truly be personalization.
Personalization begins with an appropriate assessment.
Why Is It Important to Know Your Health Status Before Starting a Diet?
Body weight is only one of the indicators that can be used to assess health.
A professional nutritional assessment may include medical history, lifestyle habits, physical activity, anthropometric measurements, and body composition, as well as biochemical information when available.
This makes it possible to identify priority areas and establish more realistic goals.
For example, a person who wants to “lose 22 pounds” may need a strategy primarily focused on reducing body fat while preserving muscle mass.
An athlete, on the other hand, may need to improve performance, recovery, and energy availability.
And a person with diabetes, insulin resistance, hypertension, or dyslipidemia may require additional clinical goals.
The same scale may show the same number, but the nutritional strategy can be completely different.
Adherence: One of the Keys to Success
A diet can be nutritionally excellent, but if a person cannot maintain it, its usefulness in real life will be limited.
Research on adherence to weight-loss interventions identifies multiple factors associated with success, including dietary and behavioral factors, physical activity, and individual characteristics. A 2024 umbrella review concluded that developing personalized strategies according to the characteristics of specific populations may improve adherence.
This explains why a good nutritional intervention should not only ask:
“What foods should the patient eat?”
It should also ask:
“How can we help this patient maintain these habits?”
This is where seemingly simple but fundamental factors come into play:
- What time does the patient work?
- Do they eat at home or at restaurants?
- Do they travel frequently?
- Who prepares their meals?
- What foods do they enjoy?
- What foods do they avoid?
- Do they exercise?
- How much do they sleep?
- Do they have changing schedules?
- What situations cause them to abandon the plan?
Answering these questions transforms a generic diet into a truly personalized nutritional intervention.
How Does a Personalized Nutrition Approach Work?
At ALFA Nutrición y Fitness, the process may begin with a comprehensive assessment to understand the patient’s starting point.
1. Initial Assessment
Medical history, goals, habits, dietary patterns, physical activity, and other relevant factors are analyzed.
2. Body Composition Assessment
When appropriate, tools such as bioelectrical impedance analysis may be used to complement the assessment of body weight, body fat, and muscle mass.
3. Identification of Goals
The goal may be:
- Fat loss.
- Muscle gain.
- Improved athletic performance.
- Metabolic control.
- Disease prevention.
- Improved eating habits.
- Overall well-being.
4. Plan Development
A nutritional strategy is developed according to the patient’s needs and preferences.
This may include culturally familiar foods, restaurant options, alternatives for busy days, and strategies for social events.
5. Follow-Up and Adjustments
A nutritional plan should not remain unchanged for months if the patient’s needs change.
Follow-up makes it possible to identify what is working and what needs to be modified.
The NIDDK recommends that effective programs include guidance, ongoing support, habit monitoring, and specific strategies for maintaining results. It also states that the best plan is one supported by science and adapted to the person’s health, cultural needs, preferences, and values.
Healthy Eating: Learning How to Eat, Not Living on a Diet
One of the most important goals of clinical nutrition is helping patients develop skills that continue after completing a program.
Healthy eating does not mean eating perfectly.
It means learning to make better choices more consistently.
For example:
- Increase vegetables and fruits.
- Consume adequate protein.
- Prioritize sources of dietary fiber.
- Choose higher-quality fats.
- Moderate added sugars.
- Limit ultra-processed foods.
- Maintain adequate hydration.
- Learn portion control.
- Plan meals ahead of time.
Functional foods may also be incorporated into a healthy dietary pattern when there is a nutritional reason to do so.
However, no individual food can replace a balanced diet or medical treatment when a disease is present.
What Role Does Evidence-Based Nutrition Play?
Evidence-based nutrition combines the best available scientific information with professional expertise and the individual characteristics of the patient.
This is especially important in an era when social media can present trendy diets as universal solutions.
Personalized nutrition is one example. The most recent evidence is promising, but it does not yet allow us to claim that every form of personalized nutrition is superior to all conventional interventions. A 2026 systematic review and meta-analysis found modest effects on body weight and body fat, while also noting that personalization methods vary considerably and that the certainty of evidence differs across outcomes.
This is precisely what it means to work with science:
not exaggerating results and also recognizing the limitations of the available evidence.
Success Depends on Both the Patient and the Professional
Successful nutritional treatment requires genuine collaboration.
The professional provides:
- Assessment.
- Scientific knowledge.
- Nutrition education.
- Strategy development.
- Follow-up.
- Adjustments.
The patient provides:
- Active participation.
- Communication.
- Consistency.
- Willingness to change.
- Honesty during follow-up.
The goal is not to find someone to blame when a plan does not work.
The goal is to identify the obstacle and find a solution.
A nutritional consultation should be a process of support and guidance, not a judgment of the patient’s decisions.
The Situation in Mexico and the Tijuana–San Diego Region
Mexico and the United States face a significant burden of overweight, obesity, and metabolic diseases. In the United States, for example, the most recent national data show that more than 7 out of 10 adults are overweight or have obesity when both categories are considered together.
In a border region such as Tijuana–San Diego, people may be exposed to different dietary patterns, long working hours, meals away from home, and widespread availability of ultra-processed products.
This makes a flexible strategy particularly relevant.
A person who lives in Tijuana and works in San Diego may need a completely different plan from someone who works from home.
Personalized nutrition makes it possible to consider precisely this reality.
Habits You Can Start Today
While working with a healthcare professional, there are some general actions that can make the process easier:
1. Don’t Try to Change Everything at Once
Start with two or three specific habits.
2. Prioritize Protein and Fiber
They may contribute to improved satiety as part of a balanced diet.
3. Plan Your Meals
Having healthy options available reduces dependence on last-minute decisions.
4. Learn How to Eat Away From Home
Healthy eating should also work in restaurants and during social events.
5. Move Regularly
Physical activity provides benefits that go beyond body weight.
6. Take Care of Your Sleep
Getting adequate sleep is part of a healthy lifestyle and may help with habit management.
7. Measure More Than Weight
Body composition, measurements, performance, energy levels, and clinical parameters can provide additional information about your progress.
Conclusion: You Don’t Need Another Diet; You Need a Strategy
Diets do not necessarily “fail” because they are bad. Many strategies work when properly implemented. The real challenge appears when a person tries to maintain a plan for months or years that does not consider their needs, preferences, circumstances, health, and goals.
Current evidence supports a fundamental idea:
There is no single perfect diet for everyone.
Different dietary patterns can work, and adherence, professional support, and personalization are essential elements for achieving sustainable results.
Personalized nutrition seeks to change the question from:
“What diet is trending?”
to:
“What nutritional strategy is right for me?”
At ALFA Nutrición y Fitness, strategically located in Otay Universidad, Tijuana, Baja California, we work with patients from Tijuana, San Diego, and surrounding areas through a professional approach focused on health goals, body composition, athletic performance, and disease prevention.
If you have tried different diets without being able to maintain your results, perhaps the next step is not to start another diet.
It may be time to receive a professional assessment and build a nutritional strategy adapted specifically to you.
ALFA Nutrición y Fitness — Otay Universidad, Tijuana, B.C.
618 367 1111
Schedule a strategic consultation and begin working on a nutrition plan designed around your reality.
