Different types of tests are suitable for these two goals. For losing weight, a DNA metabolism test from a saliva sample (e.g., WeightLoss SLIM, €169) shows the genetic predisposition for fat and carbohydrate utilization. When energy levels decline, a nutrient blood test from capillary blood (VitalCheck Complete, €169) measures the current status of iron, vitamin D, and vitamin B12. DNA tests describe predispositions; blood tests describe current status. No home test replaces a medical diagnosis.
Two goals, two biological questions
“Losing weight” and “having more energy” sound like one connected concern, but they lead to two different measurements. A test can show either your predisposition or your current status—rarely both at once.
DNA tests analyze gene variants (SNPs, individual differences in the building blocks of genetic material) from a saliva sample. These predispositions remain stable throughout life. Such a test answers questions like: Does my body tend to utilize carbohydrates or fats, and how pronounced is my insulin sensitivity? However, it does not indicate how much you currently weigh or whether a diet is effective.
Persistent fatigue, on the other hand, is usually a question of your current status. Common, readily measurable causes include low iron stores (ferritin), a vitamin D or vitamin B12 deficiency, or impaired thyroid function. These values fluctuate over time and can only be measured using a blood sample, not through genes.
For this combination of goals, that means: Anyone who wants to understand their starting point often combines a DNA test (predisposition, nutrition strategy) with a nutrient blood test (current energy metabolism). If you have only one goal, choose the appropriate sample type.
Home tests for weight loss and energy compared
| Goal / symptom | Test | Sample type | Measured parameters | Price | Result after |
|---|---|---|---|---|---|
| Losing weight – understanding genetic predisposition | WeightLoss SLIM DNA test | Saliva | 80+ gene variants: FTO, PPARG, ADRB2, TCF7L2, fat/carbohydrate utilization, insulin sensitivity | €169.00 | 15–25 business days |
| Lose weight with a specific nutrition plan | DNA metabolism analysis including 28-day plan | Saliva | 80+ gene variants + 28-day nutrition plan & recipe book | From €197.00 | 15–25 business days |
| Athletic performance & recovery | Fitness VITALITY DNA test | Saliva | 100+ gene variants: VO2max, muscle type, fat burning, muscle fatigue, recovery | €197.00 | 15–25 business days |
| Fatigue & lack of energy – nutrient status | Nutrient VitalCheck Complete | Capillary blood | 15 biomarkers: vitamin D3, B12, folic acid, ferritin, magnesium, zinc, selenium, and more | €169.00 | 3–5 business days |
| Targeted individual value for fatigue | Ferritin, vitamin D, or TSH rapid test | Capillary blood | 1 marker each (iron stores, vitamin D, or thyroid level) | €14.50 each | 3–5 business days |
Preise Stand Juli 2026, inkl. MwSt., Änderungen vorbehalten. Bearbeitungsdauern gemäß aktuellem Anbieterstand. Vor dem Kauf bitte auf mybody-x.com prüfen.
Die Tests im Detail
WeightLoss | SLIM DNA-Test (169 €)
Der WeightLoss SLIM ist ein DNA-Stoffwechseltest für das Ziel Gewichtsreduktion. Aus einer Speichelprobe werden über 80 Genvarianten (SNPs) ausgewertet, darunter das FTO-Gen (mit Körpergewicht assoziiert), PPARG, ADRB2 und TCF7L2. Der Bericht ordnet ein, wie dein Körper Fette und Kohlenhydrate verarbeitet, wie ausgeprägt die Insulinempfindlichkeit ist und wie hoch der genetisch bedingte Bedarf an Vitaminen und Mineralstoffen (u. a. B6, B9, B12, D, Eisen) einzuschätzen ist. Enthalten sind 24 Analyseberichte in 5 Kapiteln (rund 140 Seiten) sowie eine Bewertung von über 1.000 Lebensmitteln. Der Test liefert damit eine Grundlage für die Ausrichtung der Ernährung, nicht jedoch eine Vorhersage über den Erfolg einer bestimmten Diät. Details: WeightLoss SLIM DNA-Test.
DNA Stoffwechselanalyse inkl. 28-Tage-Plan (ab 197 €)
This option is based on the same genetic analysis (80+ gene variants from saliva), but supplements it with an actionable roadmap. It includes a personalized 28-day nutrition plan (MY FOODBOOK), 60 daily recipes, as well as a diary and tracker. The test is intended for anyone who wants not only the genetic analysis but also a concrete structure for putting it into practice in everyday life. In addition to the basic option starting at €197, extensions with the “Sport & Movement” and “Nutrition & Health” modules are available. Further goals are covered by NutriCare INFINITY (€269) or Longevity ALL IN ONE (€369). Details: DNA metabolic analysis with a 28-day plan.
Fitness | VITALITY DNA test (€197)
If “more energy” primarily means athletic performance, Fitness VITALITY is the right DNA analysis. More than 100 gene variants are analyzed from the saliva sample, including VO2max (maximum oxygen uptake), muscle fiber type, fat burning, muscle fatigue, recovery after training, and injury risk. The report covers 32 analysis sections in 6 chapters (around 160 pages). Important context: The test describes genetic predispositions related to training and regeneration. Whether you actually feel energized also depends on factors such as sleep, nutrient status, and training condition, which this test does not measure. Details: Fitness VITALITY DNA test.
Nutrient | VitalCheck Complete (€169)
For the question “Why am I constantly tired?” a blood test is often more informative than a DNA test because it shows your current nutritional status. VitalCheck Complete measures 15 biomarkers from capillary blood (a finger-prick blood sample): 25-OH vitamin D3 (the storage form of vitamin D), vitamin B12, transcobalamin, folic acid, calcium, magnesium, sodium, ferritin (the storage form of iron), zinc, selenium, manganese, copper, as well as HDL, LDL, and triglycerides. Iron, vitamin D, and vitamin B12 levels in particular are among the most common measurable causes of exhaustion. A more affordable option is VitalCheck Basic (€139). There are also rapid tests for individual markers costing around €14.50 (e.g., ferritin, vitamin D, TSH, the thyroid-stimulating hormone); see Vitamin Deficiency Tests and Hormone Tests. Details: Nutrient VitalCheck Complete.
What these tests cannot do
Home tests are guides, not diagnoses. Before making a purchase, these limitations matter more than any product feature:
DNA tests cannot predict weight loss. They show genetic predispositions. Whether you lose weight depends primarily on your behavior, diet, exercise, and environment—not on individual gene variants. No test guarantees an outcome.
Finger-prick blood tests are screening tests, not medical laboratory diagnostics. Borderline or abnormal results should be confirmed by a venous blood draw at a doctor's office before you change your diet or start taking supplements.
Persistent fatigue can have causes that no home test detects. These include thyroid disorders, diabetes, sleep apnea, depressive disorders, heart or kidney disease, and anemia unrelated to iron deficiency. You should seek medical evaluation especially if you experience: unintentional weight loss, exhaustion despite getting enough sleep for several weeks, shortness of breath, a racing or irregular heartbeat, fever or night sweats, or blood in your stool.
Every test is only a snapshot. A single measurement or genetic profile is no substitute for follow-up monitoring or an overall medical assessment of your symptoms.
Testing, laboratory procedures, and data protection
- Order the test kit online (free shipping on orders over €49).
- Collect the sample at home—saliva for the DNA test, a drop of blood from the fingertip for the nutrient test. It takes around 10 minutes.
- Send in the pseudonymized sample free of charge using the individual identification code.
- Analysis in an ISO-certified laboratory in Germany. Data processing is certified according to ISO/IEC 27001 (the information security standard).
- Access results in the online portal: DNA analyses after 15–25 business days, blood tests after 3–5 business days.
- Data protection: Processing is carried out in compliance with the GDPR. According to the provider, the saliva sample and DNA sequence are completely destroyed two months after the analysis is completed.
Frequently asked questions
Weight loss or energy—which test should I take first?
That depends on the more pressing goal. If noticeable fatigue is the main concern, a nutrient blood test makes sense because it shows the current status of iron, vitamin D, and B12 and provides results in just 3–5 business days. If the goal is a long-term nutrition strategy, a DNA test provides information about genetic predisposition.
Can a DNA test tell me whether I will lose weight?
No. A DNA test shows genetic predispositions for fat and carbohydrate metabolism, not your current weight status or the success of a diet. Whether you lose weight is determined primarily by diet, exercise, and everyday habits. Genetic analysis can help guide your approach, but it cannot guarantee anything.
Why am I constantly tired—can a blood test help?
Common measurable causes of exhaustion include low iron stores (ferritin), a vitamin D or B12 deficiency, and impaired thyroid function. A nutrient blood test can measure these values. If symptoms persist despite normal results, medical evaluation is necessary.
How do saliva and blood tests differ?
A DNA test saliva sample shows gene variants that remain stable throughout life—i.e., genetic predisposition. A nutrient test’s drop of blood measures current nutritional status, which changes over time. For “understanding predisposition,” choose saliva; for “checking current status,” choose blood.
How long does it take to get the results?
DNA analyses from saliva require 15–25 business days after the sample is received. Nutrient blood test results from capillary blood are available after 3–5 business days. The results are provided in the online portal.
Does an at-home test replace a visit to the doctor?
No. At-home tests are for guidance and do not replace a medical diagnosis or treatment. Abnormal results or persistent symptoms should be evaluated by a doctor, especially if warning signs such as unintentional weight loss, shortness of breath, or exhaustion lasting several weeks occur.
How much does the combination of DNA and nutrient tests cost?
A DNA metabolism test such as WeightLoss SLIM (€169), together with Nutrient VitalCheck Complete (€169), costs €338. If you only want to check individual energy values, you can instead choose rapid tests for around €14.50 per marker.
Are the results suitable for changing your diet?
The reports contain specific assessments, such as macronutrient utilization and nutrient requirements, in some cases including food ratings and a 28-day plan. They are intended as guidance. If you have pre-existing conditions or take dietary supplements, you should discuss implementation with a medical or nutrition professional.
Sources
- World Health Organization (WHO): WHO guideline on use of ferritin concentrations to assess iron status in individuals and populations, 2020.
- German Nutrition Society (DGE): Reference values for vitamin D intake, 2012 edition.
- Pearce SHS et al. for the European Thyroid Association (ETA): 2013 ETA Guideline: Management of Subclinical Hypothyroidism, European Thyroid Journal 2013;2(4):215–228.
- Frayling TM et al.: A common variant in the FTO gene is associated with body mass index and predisposes to childhood and adult obesity, Science 2007;316(5826):889–894.
Choose the right test
For genetic predisposition related to weight loss or current energy metabolism: