SCIENTIFIC REVIEW / NUTRITION / PREVENTIVE HEALTH

HEALTHY

Comprehensive Guide on Nutrition and Eating Habits for a Healthy Life

CORE MESSAGE

Maintaining optimal health and preventing chronic diseases requires more than just including healthy foods in the diet, it involves a critical assessment of the foods we regularly consume and the cooking practices we adopt daily.

This document provides a practical, thorough, and up-to-date scientific guide on the most harmful dietary components and habits, outlining their pathophysiological effects, their connection to chronic diseases, and, most importantly, how to replace them with safer, more sustainable and functional alternatives.

General educational resource. Clinical decisions depend on age, medications, frailty, pregnancy, renal function, baseline risk and local recommendations.

01 Added sugars and sugary beverages (Glucose & Simple Carbohydrates)

• Scientific Rationale: Refined sugar provides calories with minimal nutritional value, causes rapid spikes in blood glucose levels, and disrupts normal insulin response.
  Health Impacts: Significantly increases risk of insulin resistance (a precursor to type 2 diabetes), obesity, and cardiovascular disease. Additional effects include chronic inflammation, raise dental caries risk, non-alcoholic fatty liver disease (NAFLD), and premature skin aging.

• Reduce / replace: Reduce regular soda, sugar-added energy drinks, syrupy coffees, commercial juices, candies, sweetened chocolate, pastries, industrial baked goods, sugary dairy desserts (flavored yogurts, flan, ice cream), sugary breakfast cereals, and sauces with added sugar.

• Better everyday choices: Water, naturally flavored water with fruit slices, sparkling water, unsweetened herbal teas/coffee, whole fruit and plain natural yogurt.

02 Refined starches and high-Glycemic Index Foods (GI)

• Scientific Rationale: Glycemic Index indicates how quickly a food raises blood glucose levels. High-GI foods cause sharp glucose and insulin spikes, which over time can lead to insulin resistance and metabolic disturbances.
  Health Impacts: Increased risk of type 2 diabetes, obesity, cardiovascular diseases, breast and colorectal cancer, and worsened prognosis in those diseases. These foods also cause rapid energy highs followed by crashes, promoting hunger, and fatigue.

• Reduce / replace: White bread, white rice, processed potatoes, instant mashed potatoes, refined breakfast cereals, industrial pastries, and all foods made with refined flour.

• Better everyday choices: Oats, whole-grain breads, brown rice, whole-grain pasta, low-to-medium-GI foods like legumes, and pasta cooked al dente instead of overcooked.

03 Ultra-processed foods

• Scientific Rationale: These products often contain trans fats, added sugars, excessive salt, and numerous artificial additives to enhance texture, flavor, and shelf life.

• Health Impacts: Promote chronic inflammation and raise the risk of obesity, type 2 diabetes, cardiovascular disease, metabolic syndrome, colorectal and breast cancer, kidney and liver disease, gastrointestinal problems, and gut microbiota imbalance.

• Reduce / replace: Commercial snacks (chips, cookies), processed meats (sausages), frozen ready meals, instant soups and noodles, and fast food (industrial burgers, pizzas).

• Better everyday choices. Fresh, whole foods and minimally processed ingredients.

04 High-temperature cooking and charring (>120°C / 248°F)

• Scientific Rationale: Cooking at high temperatures—especially frying, grilling, roasting, and broiling—produces potentially toxic compounds like acrylamides (from starches like bread), polycyclic aromatic hydrocarbons (PAHs), and advanced glycation end products (AGEs), particularly in meats and fish.

• Health Impacts: Oxidative stress, intestinal inflammation, increased cancer risk, cellular damage, and accelerated aging.

• Reduce / replace. Deep frying, overly charred or toasted foods, frequent barbecues. Examples include overly toasted bread, French fries, roasted potatoes, and cookies.

• Better everyday choices. Steaming, boiling, slow cooking, baking at low temperatures, and quick sautéing.

05 Red meat

• Scientific Rationale: While red meats provide high-quality protein, heme iron, zinc, and B vitamins (especially B12), excessive and frequent intake—especially when cooked at high temperatures—is associated with adverse health effects. High-heat methods (grilling, frying) produce heterocyclic amines (HCAs) and PAHs, which are potentially carcinogenic.

• Health Impacts: Increased risk of colorectal cancer, type 2 diabetes, and cardiovascular disease.

• Reduce / replace. Limit red meat to 1–2 servings per week (350–500 g/week). Avoid deep-frying, charring, or grilling with reused oils, especially in combination with alcohol.

• Better everyday choices. Skinless poultry, plant-based proteins (legumes, tofu, quinoa, nuts), and low-heat cooking. Always pair red meat with fiber-rich vegetables and antioxidant spices (e.g., turmeric, ginger, rosemary).

06 Processed and smoked meats

• Scientific Rationale: Processed meats contain nitrites/nitrates, which can form carcinogenic nitrosamines. Smoking also generates PAHs.

• Health Impacts: Increased risk of colorectal, gastric, pancreatic, and prostate cancer; cardiovascular disease; immune disruption; and gut microbiota imbalance.

• Reduce / replace. Cold cuts (bacon, salami, chorizo, sausage, mortadella), industrial meat products (burgers, frozen lasagna, meat pizzas), and sauces with processed meats (industrial Bolognese, meatballs).

• Better everyday choices. Fresh, additive-free local meats. Substitute processed meats with healthier options like hummus, avocado, fresh cheese, marinated tofu, boiled eggs, or canned sardines in olive oil.

07 Contaminated Fish (Heavy Metals & POPs)

• Scientific Rationale: While fish are rich in protein, omega-3s, and micronutrients, large or long-lived species can accumulate heavy metals (mercury, lead, cadmium, arsenic) and persistent organic pollutants (dioxins, PCBs).

• Health Impacts: Neurological damage (especially in fetuses and children), kidney and liver toxicity, cardiovascular risks, and increased cancer risk.

• Reduce / replace. Limit intake of large fish to once per week (e.g., swordfish, shark, wild salmon, tuna, halibut).

• Better everyday choices. Small, short-lived fish (sardines, mackerel, anchovies, cod, hake, sole). Choose certified sustainable sources. Remove skin and fatty parts where toxins accumulate.

08 Excess Salt (Sodium)

• Scientific Rationale: Although sodium is essential, over 90% of the global population exceeds recommended intake—mostly via processed foods.

• Health Impacts: Increased risk of hypertension, cardiovascular disease, kidney and liver damage.

• Reduce / replace. Processed meats, pickled vegetables, canned foods, instant soups, industrial broths, sauces (soy, ketchup, BBQ), industrial baked goods, frozen ready meals, salty snacks, and processed cheeses.

• Better everyday choices. Stay under 5g of salt/day (≈2g sodium). Read labels (<0.3g salt/100g), and flavor meals with herbs, spices, lemon, and vinegar.

09 Alcohol

• Scientific Rationale: Ethanol is a psychoactive and neurotoxic substance with systemic effects. No amount is considered entirely safe.

• Health Impacts: Increased risk of cancers (especially breast, liver, esophagus, oral cavity, pancreas), liver disease and cirrhosis, depression, anxiety, cognitive decline, and cardiovascular disease.

• Reduce / replace. Max. 1 standard drink/day for women (≈100 ml wine or 330 ml beer), 2 for men. Avoid binge drinking. Completely avoid during pregnancy, adolescence, or when taking hepatotoxic/psychotropic drugs.

• Better everyday choices. Sparkling water, herbal teas, vegetable juices, non-alcoholic fermented drinks. Focus on mood-enhancing, healthy lifestyle habits (exercise, sleep, social connection).

10 Industrial trans fats and saturated-fat quality

• Scientific Rationale: Industrial trans fats are produced via partial hydrogenation of vegetable oils to enhance texture and shelf life. These fats integrate abnormally into cell membranes, disrupting metabolism and promoting inflammation.

• Health Impacts: Increased risk of breast, prostate, and colon cancer, heart disease, atherosclerosis, diabetes type 2, and chronic inflammation.

• Reduce / replace. Products with “partially hydrogenated oils”, margarine, industrial baked goods (croissants, donuts), crackers, microwave popcorn, fried snacks, and reheated oils.

• Better everyday choices. Extra virgin olive oil, avocado, nuts, seeds, and oily fish. Avoid prolonged frying. Choose trans fat-free labeled products.

11 Canned foods (with BPA)

• Scientific Rationale: Most canned foods are lined with BPA-containing resins, a known endocrine disruptor. These foods are also often high in salt, sugar, and preservatives.

• Health Impacts: Endocrine and metabolic disruption, hypertension, and developmental issues (neurological, reproductive) in fetuses and children.

• Reduce / replace. Non-BPA-free cans, canned foods with long ingredient lists, soups, sauces, and canned fruits in syrup.

• Better everyday choices. Glass jars or BPA-free packaging. Choose frozen, additive-free vegetables.

12 Excesive Vitamin Supplementation (Vitamin A&C)

• Scientific Rationale: Essential nutrients prevent deficiencies; excess preformed vitamin A can be toxic, while high-dose beta-carotene supplements increased lung cancer risk in smokers in randomized trials. Vitamin C can act as a pro-oxidant at high doses (>2000 mg/day).

• Health Impacts: Vitamin A excess: Nausea, blurred vision, fatigue, liver damage, birth defects, and increased lung cancer risk in smokers. Vitamin C excess: Gastrointestinal discomfort, oxidative stress, and kidney stones.

• Reduce / replace. Avoid unprescribed vitamin A or beta-carotene supplements, megadoses of vitamin C (>1000 mg/day), or uncontrolled multivitamin use.

• Better everyday choices. Food-first choices and targeted replacement for demonstrated deficiency or special circumstances (e.g., B12 in vegan diets, folate around conception). Consult a healthcare provider before supplementing.

Conclusion

The true harm lies not in one food alone, but in persistent patterns of unhealthy eating, harmful cooking methods, and disordered habits. A diet based on whole, fresh, home-cooked, and nutrient-balanced foods is one of the most powerful tools for preventing disease and promoting long-term wellbeing.

Disclaimer: Educational information, not a diagnosis, prescription or substitute for personalised medical care. Recommendations for pregnancy, children, adults with kidney disease, people with low body weight or frailty, and patients receiving active cancer treatment may differ.

Disclaimer: The information provided by AEVUM MCM is for educational and informational purposes only and does not constitute medical advice or product endorsement. We do not guarantee the accuracy, safety, or effectiveness of featured products, treatments, or technologies. Always consult qualified professionals before making health-related decisions.