World Obesity Federation
Also known as: International Association for the Study of Obesity, International Obesity Task Force, Iaso, Iotf
World Obesity is an umbrella organisation for national obesity associations and comprises 52 member associations, representing 56 countries. The main aim of the charity is to improve global health by promoting the understanding of obesity and weight-related diseases through scientific research and dialogue, while encouraging the development of effective policies for prevention and management.
Activities & Mission
World Obesity is an umbrella organisation for national obesity associations and comprises 52 member associations, representing 56 countries. The main aim of the charity is to improve global health by promoting the understanding of obesity and weight-related diseases through scientific research and dialogue, while encouraging the development of effective policies for prevention and management.
Areas of Operation
Where this charity is registered to operate, as self-declared to the Charity Commission. These are regulatory classifications, not a list of active programmes, and don't necessarily indicate fundraising activity in each location.
Local Authority
Financial Information
Financial Efficiency
Latest Financial Breakdown
Income Sources
Expenditure Categories
Financial Trend
Annual Returns
As filed with the Charity Commission for England and Wales. Most recent filing covers the financial year ending 2025.
One or more years show a significant change in income (over ±100%) compared with the prior year. This usually reflects a merger, transfer of activities, restated accounts, or a one-off legacy — not necessarily a real change in operating scale. See the methodology for context.
| Financial Year | Income | Expenditure | Charitable Spending | Net Assets | Reserves | Staff |
|---|---|---|---|---|---|---|
| 2025 | £2,406,605 | £1,998,983 | £1,648,262 | £1,393,066 | £1,393,066 | 18 / 0 |
| 2024 | £2,088,287 | £1,964,237 | £1,599,259 | £985,444 | £985,444 | 11 / 0 |
| 2023 | £948,030 | £1,210,202 | £863,731 | £861,394 | £861,394 | 14 / 0 |
| 2022 | £2,262,103 | £2,252,721 | £1,850,625 | £1,123,566 | £1,123,566 | 17 / 0 |
| 2021 | £2,701,745 | £2,574,254 | £2,122,705 | £1,114,184 | £1,114,184 | 23 / 0 |
Staff column shows: Employees / Volunteers
Frequently asked questions about World Obesity Federation
What does World Obesity Federation do?
World Obesity is an umbrella organisation for national obesity associations and comprises 52 member associations, representing 56 countries. The main aim of the charity is to improve global health by promoting the understanding of obesity and weight-related diseases through scientific research and dialogue, while encouraging the development of effective policies for prevention and management.
How much income did World Obesity Federation report in 2025?
World Obesity Federation reported total income of £2.41m and reported expenditure of £2.00m for the financial year ending 2025, based on the most recent annual return filed with the Charity Commission.
When was World Obesity Federation registered as a charity?
World Obesity Federation was registered with the Charity Commission for England and Wales on 11 August 1999 as charity number 1076981. It has been registered for 27 years.
Who runs World Obesity Federation?
World Obesity Federation is governed by a board of 14 trustees. Trustees are legally responsible for the charity's governance and are listed in full on its profile.
Where does World Obesity Federation operate?
World Obesity Federation operates in City Of Westminster, as recorded in its Charity Commission filing.
Is World Obesity Federation a registered charity?
Yes — World Obesity Federation is a registered charity in England and Wales, charity number 1076981.
Details
138 - 142 Holborn
LONDON
EC1N 2SW
Registry Information
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Also Known As
- International Association for the Study of Obesity
- International Obesity Task Force
- Iaso
- Iotf
Data & trust
- Register data refreshed
- 30 July 2026
- Methodology
- How metrics are calculated