Meal photos - Wikimedia Commons (free licenses).
fruits: same photo as berries (CC0, Wikimedia Commons)
salad: 2015 06 07 001 Salatteller.jpg - Friedrich Haag - CC BY-SA 4.0 - https://commons.wikimedia.org/wiki/File:2015_06_07_001_Salatteller.jpg
starch: Baked Sweet Potato on Salad.jpg - FitTasteTic - CC BY-SA 2.0 - https://commons.wikimedia.org/wiki/File:Baked_Sweet_Potato_on_Salad.jpg
steamedveg: Sunday roast vegetable side dish at The Stag, Little Easton, Essex, England.jpg - Acabashi - CC BY-SA 4.0 - https://commons.wikimedia.org/wiki/File:Sunday_roast_vegetable_side_dish_at_The_Stag,_Little_Easton,_Essex,_England.jpg
avocado: Avocado Hass - single and halved.jpg - Ivar Leidus - CC BY-SA 4.0 - https://commons.wikimedia.org/wiki/File:Avocado_Hass_-_single_and_halved.jpg
smoothie: A glass of hyderabad smoothie.jpg - Queen Asali - CC BY-SA 4.0 - https://commons.wikimedia.org/wiki/File:A_glass_of_hyderabad_smoothie.jpg
greenjuice: Green Smoothie.jpg - Annapowell - CC BY-SA 4.0 - https://commons.wikimedia.org/wiki/File:Green_Smoothie.jpg
juice: GlassOfJuice and carrots.JPG - Salix - CC BY 3.0 - https://commons.wikimedia.org/wiki/File:GlassOfJuice_and_carrots.JPG
greensmoothie: Kiwi Smoothie.jpg - rawpixel.com - CC0 - https://commons.wikimedia.org/wiki/File:Kiwi_Smoothie.jpg
soup: Asparagus soup (spargelsuppe).jpg - Petar Milošević - CC BY-SA 4.0 - https://commons.wikimedia.org/wiki/File:Asparagus_soup_(spargelsuppe).jpg
lemonwater: Ice water with lemon.jpg - Jon Sullivan - Public domain - https://commons.wikimedia.org/wiki/File:Ice_water_with_lemon.jpg
nuts: Almonds 1.jpg - Loadmaster (David R. Tribble) - CC BY-SA 3.0 - https://commons.wikimedia.org/wiki/File:Almonds_1.jpg
lentils: Egyptian Grains.jpg - Dina Said - CC BY-SA 4.0 - https://commons.wikimedia.org/wiki/File:Egyptian_Grains.jpg
Other photos (berries, watermelon, tea, zoodles, fish, sprouts): CC0 / public domain, Wikimedia Commons.