1. Biochemical blood test<\/strong> increased levels of glucose, cholesterol, and triglycerides<\/p>\n<\/li>\n possible decrease in uric acid (due to plasma dilution)<\/p>\n<\/li>\n electrolytes (sodium, potassium) change due to fluid retention<\/p>\n<\/li>\n<\/ul>\n 2. Complete blood count<\/a> (ZAK)<\/strong> fatty foods can cause lipemia (plasma fat), which complicates the analysis<\/p>\n<\/li>\n High-protein foods temporarily increase white blood cell levels<\/p>\n<\/li>\n caffeine or sweets - have a slight effect on hematocrit and glucose<\/p>\n<\/li>\n<\/ul>\n 3. Sugar tests (glucose, insulin<\/a>, HOMA index)<\/strong> even tea with sugar or fruit 2\u20133 hours before the analysis distorts the results<\/p>\n<\/li>\n the glucose tolerance test requires a special diet the day before<\/p>\n<\/li>\n in case of overeating or undereating, insulin levels may be unreliable<\/p>\n<\/li>\n<\/ul>\n 4. Lipid profile<\/a> (cholesterol, HDL, LDL, triglycerides)<\/strong> increases triglyceride levels by 20\u201350%<\/p>\n<\/li>\n affects the ratio of lipoproteins<\/p>\n<\/li>\n gives a false picture of cardiovascular risk<\/p>\n<\/li>\n<\/ul>\n 5. Blood test for hormones<\/strong> insulin, cortisol, leptin<\/strong> \u2014 change after eating<\/p>\n<\/li>\n TSH, T4, T3 (thyroid gland)<\/strong> \u2014 it is better to take the test on an empty stomach, but food has less of an effect<\/p>\n<\/li>\n sex hormones (estrogen, testosterone)<\/strong> \u2014 food does not have a critical effect, but it is recommended to refrain from eating 2\u20133 hours before the test<\/p>\n<\/li>\n<\/ul>\n 6. Urine<\/strong> change the color of urine<\/p>\n<\/li>\n affect pH, protein content, ketones<\/p>\n<\/li>\n increase the specific gravity of urine<\/p>\n<\/li>\n<\/ul>\n It is not recommended to eat the day before a urine test:<\/p>\n salty foods, smoked meats<\/p>\n<\/li>\n alcohol, coffee, beets<\/p>\n<\/li>\n fatty and fried foods<\/p>\n<\/li>\n<\/ul>\n 7. Kal<\/strong> fatty food (interferes with the assessment of enzymatic function)<\/p>\n<\/li>\n meat (affects latent blood)<\/p>\n<\/li>\n dairy products \u2014 can cause pH changes or white mucus<\/p>\n<\/li>\n vegetables with a lot of fiber - change the consistency<\/p>\n<\/li>\n<\/ul>\n
This study is sensitive to the composition of food, especially fats and carbohydrates. After a hearty lunch:<\/p>\n\n
The effect of food is less pronounced, however:<\/p>\n\n
These tests always<\/strong> are performed on an empty stomach because:<\/p>\n\n
Especially sensitive to fatty foods. Even one meal food before analysis<\/a>:<\/p>\n\n
Some hormones are dependent on food, for example:<\/p>\n\n
Food coloring (beets, carrots), caffeine, protein foods can:<\/p>\n\n
\n
The results of stool analysis are affected by:<\/p>\n\n
![\"Table](\"https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/person-doing-home-covid-test.jpg\")
<\/p>\n