Food, Nutrition and Energy

What this page covers

Food provides the fuel your body uses. For most people, "foods for energy" means eating enough, regularly, with variety, not eating a particular superfood. This page explains the evidence in plain terms. Conditions such as anemia are handled on their own pages.

Balanced eating

The NHS Eatwell Guide says you do not need to get the balance right at every meal, but over a day or even a week. It suggests fruit and vegetables should make up just over a third of what we eat. [1] Starchy foods such as potatoes, bread, rice, pasta and cereals are a good source of energy and of nutrients including fibre, calcium, iron and B vitamins, and wholegrain varieties are a better choice where you can. [2] MedlinePlus advises a healthy, balanced diet and plenty of water to reduce fatigue. [3] Evidence: established general recommendation. Study evidence for specific meal patterns improving everyday energy is limited.

Nutrients linked to tiredness

"Helps release energy from food" does not mean extra B vitamins add energy. For people who are not deficient, evidence for supplements against fatigue is insufficient. [7]

Meal timing, breakfast and the afternoon dip

Evidence: insufficient / mixed. A 2025 systematic review of 66 studies on skipping breakfast reports associations with several outcomes, including cognitive and mood outcomes and sports performance. The authors note causality is complex because of confounders such as diet quality and physical activity, and that studies are small and short. [8] Proper evidence not found for any specific food or meal pattern that prevents an afternoon energy dip: a PubMed search for "postprandial sleepiness meal composition afternoon dip" on 2026-10-22 returned no records. If afternoon tiredness is new or heavy, look at sleep, caffeine timing and health context first. [9]

Eating too little, especially with heavy training

The International Olympic Committee describes Relative Energy Deficiency in Sport (REDs) as health and performance problems in athletes exposed to low energy availability, meaning inadequate energy intake relative to exercise energy expenditure. [10] Overtraining consensus also lists low calorie and insufficient carbohydrate or protein intake, and iron or magnesium deficiency, among things to exclude when someone is persistently fatigued and underperforming. [11] See Recovery after exercise. Restrictive eating that leaves you tired and worried about food is a reason to seek help. See Eating disorders and disordered eating.

Fluids, alcohol and caffeine

Drink enough that your urine is pale yellow. Tea and coffee count toward fluid intake. [12] Alcohol and caffeine can affect sleep, and caffeine is covered on Caffeine and energy drinks. [13]

Food guides on this site

These pages describe common foods. They do not prove an effect on energy: Oats, Legumes, Leafy greens, Fortified foods, Coffee and Functional foods by wellness goal.