Dietary assessment tools

Which dietary assessment tools are appropriate for collecting data, that are cheap, low-cost, and adorable, like web-based methods, or brief tools. what approaches do you recommend for each? and why?

1.) A randomized weight loss intervention in obese adults involving reduced sedentarism and behavior changes.

2.) A case controlled study on dietary risk factors such as fruits and veggies, ceral

fiber for irritable bowl syndrome.