The food you eat in your 20s and 30s determines your health in your 50s and 60s.

This is not a wellness slogan. It is an epidemiological fact. The Framingham Offspring Study — one of the longest-running cardiovascular cohorts in history — found that early adult exposure (ages 20–39) to elevated blood pressure and LDL cholesterol was associated with 8- to 30-fold increases in coronary heart disease event rates later in life, even after adjusting for midlife risk factors.

Framingham Offspring Study, PLOS ONE, 2016. DOI: 10.1371/journal.pone.0154288

Diet is the single largest modifiable driver of those risk factors. What you absorb from food in early adulthood — not just what you eat, but what your body actually takes in — shapes your cardiovascular, metabolic, and immune health for decades. Timiya exists because the science on this is clear, and the tools to act on it are not.

Diet and non-communicable disease

Non-communicable diseases — cardiovascular disease, diabetes, cancer, chronic respiratory disease — kill 41 million people every year, accounting for 74% of all deaths globally. The WHO identifies four primary behavioural risk factors: tobacco use, harmful alcohol consumption, physical inactivity, and unhealthy diet. Of these, diet carries the largest burden.

WHO Fact Sheet: Noncommunicable Diseases, 2024.

The 2019 Lancet analysis of the Global Burden of Disease Study evaluated dietary consumption across 195 countries and found that suboptimal diet was responsible for more deaths than any other risk factor globally. The leading dietary risks were high sodium intake (3 million deaths), low whole grain intake (3 million deaths), and low fruit intake (2 million deaths). Cardiovascular disease accounted for the majority of diet-related deaths, followed by cancers and type 2 diabetes.

Afshin, A. et al. “Health effects of dietary risks in 195 countries, 1990–2017.” The Lancet, 393(10184), 1958–1972, 2019. DOI: 10.1016/S0140-6736(19)30041-8

Diet is not merely one risk factor among many. It is the largest modifiable contributor to global mortality. And yet most nutrition tools focus on calorie counting and macronutrient ratios, ignoring the micronutrient deficiencies that drive the metabolic and cardiovascular damage underlying NCDs.

Micronutrient deficiency — the hidden crisis

Hidden hunger — micronutrient deficiency despite adequate caloric intake — affects an estimated 2 billion people worldwide according to the WHO, though recent analyses by the Global Alliance for Improved Nutrition (GAIN) suggest the true figure is at least 3 billion. Over half of all preschool-aged children and more than two-thirds of women of reproductive age fail to consume sufficient quantities of essential micronutrients.

Stevens, G.A. et al. “New Global Estimates for Hidden Hunger.” GAIN, 2022. WHO Global Database on Micronutrient Deficiencies.

The three most prevalent micronutrient deficiencies — iron, zinc, and vitamin A — are not merely markers of undernutrition. They are independent risk factors for the chronic diseases that dominate global mortality.

These deficiencies have direct downstream consequences for NCD risk. Zinc deficiency is associated with increased blood pressure, dyslipidaemia, type 2 diabetes, inflammation, and oxidative stress. Meta-analyses of randomised controlled trials show that low-dose zinc supplementation significantly reduces fasting blood glucose, insulin resistance, total cholesterol, and LDL cholesterol — all established cardiovascular risk factors. Iron deficiency impairs oxygen transport, immune function, and cognitive performance. Vitamin A deficiency compromises immune regulation and epithelial integrity.

Ranasinghe, P. et al. “Zinc and diabetes mellitus.” Journal of Biomedical Science, 2015. Foster, M. et al. “Zinc and cardiovascular disease.” Acta Pharmacologica Sinica, 2018.

The connection between micronutrient deficiency and NCDs is not speculative. It is documented across thousands of studies and recognised by the WHO as a contributing pathway to the global NCD burden. What remains missing is a consumer-facing tool that helps individuals act on this evidence through their daily food choices.

Bioavailability — why absorption matters more than intake

This is the scientific insight at the core of Timiya. A nutrition label tells you how much iron, zinc, or vitamin A is in a food. It does not tell you how much your body will absorb. The gap between those two numbers is bioavailability, and it can vary by an order of magnitude depending on the composition of a single meal.

The foundational reference for mineral bioavailability is the WHO/FAO joint report Vitamin and Mineral Requirements in Human Nutrition (2nd edition, 2004). This document establishes the framework for understanding how food composition affects nutrient absorption, and it underpins dietary reference values used globally.

WHO/FAO. Vitamin and Mineral Requirements in Human Nutrition, 2nd ed. Geneva: World Health Organization, 2004.

Inhibitors: what blocks absorption

Tannins (polyphenolic compounds in tea and coffee) form insoluble complexes with non-heme iron, reducing absorption by 60–70% when consumed with a meal. This was first demonstrated by Disler et al. in 1975 and has been replicated consistently across subsequent studies.

Disler, P.B. et al. “The effect of tea on iron absorption.” Gut, 16(3), 193–200, 1975. DOI: 10.1136/gut.16.3.193

Phytates (inositol hexaphosphate), found naturally in grains, legumes, and seeds, bind iron and zinc in the intestinal lumen, forming insoluble complexes that resist digestion. Zinc absorption from high-phytate foods is approximately 10–15%, compared to 30–50% from refined cereals and animal-rich diets. Reducing phytic acid content from 1% to 0.1% approximately doubles zinc absorption.

Gibson, R.S. et al. “Dietary phytate, zinc and hidden zinc deficiency.” J Nutr, 2014. WHO/FAO, 2004.

Enhancers: what increases absorption

Ascorbic acid (vitamin C) is the most potent known enhancer of non-heme iron absorption. It reduces ferric iron to ferrous iron and prevents the formation of insoluble iron compounds in the gut. Hallberg, Brune, and Rossander demonstrated that adding 50 mg of vitamin C to a meal increases non-heme iron absorption 3-fold, while 100 mg increases it 4-fold. The enhancement effect is most pronounced in meals with high concentrations of absorption inhibitors such as phytate or polyphenols.

Hallberg, L., Brune, M. & Rossander, L. “The role of vitamin C in iron absorption.” Int J Vitam Nutr Res Suppl, 30, 103–108, 1989. Hallberg, L. et al. “Effect of ascorbic acid on iron absorption from different types of meals.” Hum Nutr Appl Nutr, 40(2), 97–113, 1986.

Dietary fat is required for the absorption of fat-soluble vitamins, including vitamin A (as beta-carotene), vitamins D, E, and K. Beta-carotene requires micellarisation in the small intestine, a process that depends on the presence of dietary fat. Without adequate fat in the meal, absorption of beta-carotene is severely reduced. As little as 3–5 grams of fat per meal can meaningfully improve absorption.

Jalal, F. et al. “Influence of dietary fat on beta-carotene absorption and bioconversion into vitamin A.” Nutr Rev, 56(10), 309–312, 1998.

The practical implication is that the same plate of food can deliver dramatically different nutritional value depending on what is eaten alongside it, how it is prepared, and when beverages are consumed. This is the gap that no calorie-counting app addresses.

The Kenyan dietary context

Kenya presents a particularly acute case of hidden hunger. The Kenya National Micronutrient Survey (2011) established that while overall micronutrient status improved over the previous decade, zinc deficiency prevalence actually increased. Anaemia among women of reproductive age remains at approximately 32%, according to the most recent WHO and World Bank estimates.

Kenya National Micronutrient Survey, Ministry of Health, 2011. World Bank Development Indicators: Kenya anaemia prevalence, 2023.

The Kenyan diet is predominantly plant-based, meaning most dietary iron is non-heme iron with significantly lower bioavailability than heme iron from animal sources. Staple foods — ugali (maize meal), githeri (maize and beans), sukuma wiki (collard greens) — are nutrient-dense on paper but face compounding bioavailability challenges in practice.

Githeri, for example, contains approximately 6 mg of iron per serving. But unsoaked beans are high in phytates, which bind iron and zinc. If the meal is accompanied by chai — as it commonly is — tannins from the tea reduce non-heme iron absorption by 60–70%. And if sukuma wiki is cooked without oil, the beta-carotene (pro-vitamin A) it contains cannot be efficiently absorbed, because it requires dietary fat for micellarisation.

Research published in Gut and the American Journal of Clinical Nutrition has consistently demonstrated the inhibitory effect of tea tannins on iron absorption, with reductions of 60–70% documented across multiple study designs. The magnitude of the effect depends on timing, quantity, and the composition of the rest of the meal. This is precisely the kind of interaction that a bioavailability-aware tool can calculate and address — not by telling people to stop drinking chai, but by suggesting when to drink it.

Disler et al., Gut, 1975. Hurrell et al., Am J Clin Nutr, 2010. Ahmad Fuzi et al., Am J Clin Nutr, 2017.

Prevention vs treatment — the economic argument

The global economic case for NCD prevention through dietary improvement is overwhelming. The WHO's 2017 “Best Buys” — a set of 16 cost-effective interventions for NCD prevention and control — includes dietary interventions alongside tobacco and alcohol policies. Implementing all 16 interventions across all countries between 2018 and 2025 would avert an estimated 9.6 million premature deaths.

WHO. “Tackling NCDs: Best buys and other recommended interventions for the prevention and control of noncommunicable diseases.” Geneva, 2017.

Prevention is cheaper than treatment at every level — individual, household, and national. But prevention requires a tool that reaches people before diagnosis, in the context of their daily routines, at a cost they can afford. The most accessible and frequent health behaviour is eating. Three meals a day, every day. That is the intervention surface.

Why existing solutions fall short

The global nutrition app market is built on a model that tracks calories and macronutrients — protein, carbohydrates, fat. This is useful for weight management, but it does not address the micronutrient deficiencies and bioavailability interactions that drive NCD risk.

No existing app accounts for the fact that chai consumed with githeri reduces iron absorption by 60–70%. No existing app knows that sukuma wiki cooked without oil delivers near-zero usable vitamin A. No existing app has a food database that recognises how Kenyans actually name, prepare, and combine their food. The science of bioavailability is established. The consumer product that applies it to daily meals is not.

Our approach — what Timiya does differently

Timiya encodes established nutrition science into a daily tool. Every interaction is grounded in peer-reviewed research. The product does three things, and each one is built on a specific body of evidence.

Timiya is a nutrition information tool. It does not diagnose, treat, or prescribe. The information on this page summarises published research and is not medical advice.

The science exists. The product is new.

The research behind bioavailability-aware nutrition is decades old and peer-reviewed across thousands of studies. What has not existed until now is a consumer product that applies this research to the meals people actually eat, in the food cultures they actually belong to, at a cost they can actually afford. The food is the same. The change is in how you prepare and combine it.