The eight B vitamins are the engine room of your metabolism — the cofactors and coenzymes that make energy production possible. They don't provide energy directly; rather, they enable the biochemical processes that convert food into ATP (the body's energy currency). Without adequate B vitamins, these processes slow or fail, and the result is the fatigue, cognitive fog, and physical symptoms that characterise deficiency. Because they're water-soluble, your body cannot store them in meaningful quantities, making regular dietary provision genuinely important.
The Eight B Vitamins and Their Key Roles
B1 (Thiamine): Required for converting carbohydrates into energy and for nerve function. Deficiency causes beriberi and Wernicke's encephalopathy (typically seen in severe alcohol dependence). Sources: whole grains, legumes, pork, yeast extract (Marmite).
B2 (Riboflavin): Central to energy metabolism and antioxidant function. Important for skin, eyes, and nerve function. Sources: milk, yoghurt, eggs, almonds, lean meat. Deficiency causes mouth sores and photosensitivity.
B3 (Niacin): Critical for over 200 metabolic reactions. At high doses, it reduces LDL cholesterol and raises HDL. Sources: chicken, tuna, beef, peanuts, mushrooms, whole grains.
B5 (Pantothenic acid): Required for synthesising coenzyme A, essential for fat and carbohydrate metabolism. Widely distributed — deficiency is rare. Sources: virtually all animal products, avocado, legumes, whole grains.
B6 (Pyridoxine): Involved in over 100 enzyme reactions, including amino acid metabolism and neurotransmitter synthesis (serotonin, dopamine, GABA). Required for haemoglobin production. Sources: chicken, fish, potatoes, bananas, fortified cereals.
B7 (Biotin): Required for fatty acid synthesis and gluconeogenesis. Important during pregnancy. Genuine dietary deficiency is rare. Sources: eggs, liver, nuts, sweet potatoes.
B9 (Folate/Folic acid): Critical for DNA synthesis and cell division — essential during pregnancy for neural tube formation. Sources: dark leafy greens, legumes, asparagus, liver. The synthetic form (folic acid) in supplements and fortified foods is more bioavailable than food folate.
B12 (Cobalamin): Required for nerve function, red blood cell production, and DNA synthesis. Found almost exclusively in animal products — supplementation or fortified foods are essential for vegans. Absorption declines with age, making deficiency common in older adults regardless of dietary intake.
Who's at Risk of B Vitamin Deficiency
Vegans and strict vegetarians are at particular risk of B12 deficiency (the most serious) and may have lower intakes of B2 and B3 from reduced animal product consumption. Older adults are at risk of B12 deficiency due to declining intrinsic factor production even with adequate dietary intake. People who drink alcohol heavily have impaired B1 and B12 absorption and metabolism. Pregnant women have significantly increased folate and B12 requirements. People taking metformin, proton pump inhibitors, or certain anticonvulsants may have impaired B12 absorption.
Food-First Approach
A diet containing a variety of animal products (eggs, dairy, fish, lean meat) alongside whole grains and leafy vegetables provides all eight B vitamins in adequate amounts for most people. Vegans need to supplement B12 or consume fortified foods (plant milks, nutritional yeast, fortified cereals) consistently. A daily multivitamin providing 100% of the reference nutrient intake for B vitamins is a reasonable insurance policy for those with risk factors for deficiency, though food sources are almost always preferable where dietary access allows.
Get These Nutrients Through Vanda's Kitchen
Understanding B vitamins and energy is the first step. The practical next step is ensuring your daily diet actually delivers the nutrients your body needs. For City of London workers, Vanda's Kitchen's freshly prepared Filipino-inspired lunch provides a genuinely nutritious alternative to the processed options that dominate the EC4 lunch scene. Our food is built around lean proteins, fresh vegetables, and complex carbohydrates — a natural source of the nutrients that B vitamins and energy research identifies as important.
Our certified halal, 100% nut-free kitchen near St Paul's Cathedral delivers to offices across the City. Every item is freshly prepared and fully allergen-labelled. For a genuinely nutritious working lunch, see our healthy office lunch delivery guide and view our team lunch options.
For related reading, see eating for energy guide and vitamin B12 deficiency guide. WhatsApp us or order for your team today.
Fresh, Nutritious Food at Vanda's Kitchen
Vanda's Kitchen near St Paul's Cathedral EC4 provides one of the most nutritionally complete and allergen-safe food options in the City of London. Our Filipino-inspired menu is built around lean proteins, fresh vegetables, and complex carbohydrates — the nutritional combination that supports sustained energy, cognitive performance, and the various health outcomes covered in this article. Our food is certified halal, prepared in a 100% nut-free kitchen, and fully allergen-labelled, making it appropriate for the broadest range of dietary requirements in London's diverse workforce.
For City professionals who want genuinely nutritious daily lunches without leaving the office, our Freedom Tray delivery service provides fresh, labelled food to your desk from our EC4 kitchen. Our Selfridges Food Hall presence confirms the quality standard we maintain. To order for your team or to discuss corporate delivery, view our team lunch options, WhatsApp us, or send an enquiry. Read our healthy office lunch delivery guide for more on what we offer.