Here is a comprehensive summary of the information on why it's hard to lose weight, factors that contribute to obesity, and foods that can help or hinder weight loss:

**Why Is It So Hard to Lose Weight?**
* A Molecular Reason Why Obese People Have Trouble: Obesity is a complex disorder that involves multiple genetic and environmental factors.
* 9 Reasons Why Obesity is Not Just a Choice: Obesity is not just a matter of willpower or personal responsibility, but rather a complex condition that involves multiple biological, psychological, and environmental factors.
* Why it's so hard to lose excess weight and keep it off: Weight loss is difficult because it requires significant changes to diet and lifestyle habits, which can be challenging to maintain over time.

**Factors That Contribute to Obesity**
* A Molecular Reason Why Obese People Have Trouble: Obesity is a complex disorder that involves multiple genetic and environmental factors.
* Blame corporate greed, not the obese: The obesity epidemic is not solely the result of individual choices or lack of willpower, but rather the result of a complex interplay of biological, psychological, and environmental factors.
* Obesity and Corporate Greed: The food industry's marketing and production strategies can contribute to the development of obesity by promoting high-calorie, high-fat foods and drinks.

**Marijuana and Body Weight**
* Marijuana and Body Weight - PMC: Marijuana use has been linked to changes in appetite and metabolism, which can affect body weight.
* Effects of Δ9-Tetrahydrocannibinol (THC) on Obesity at ... - NCBI: THC has been shown to have anti-obesity effects in some studies.
* Why Does Marijuana Make You Lose Weight?: Marijuana use has been linked to changes in appetite and metabolism, which can lead to weight loss.

**Foods That Help with Weight Loss**
* Egg
* Avocado
* Basil Seed Drink
* Salmon
* Leafy greens
* Whole grain
* Bean
* Apple
* Yogurt
* Grapefruit
* Greek Yogurt
* Quinoa
* Vegetable
* Nut (e.g. almonds)
* Lentil
* Dark chocolate (in moderation)
* Sweet potato
* Cottage Cheese
* Legumes
* Cruciferous vegetables
* Fruit
* Spinach
* Brown Rice
* Oatmeal

**Foods That Cause Obesity**
* Soda
* Sugar-sweetened coffee
* Ice cream
* Pizza
* Cookies
* Doughnuts
* French fries
* Potato chips
* Sugary breakfast cereals
* Chocolate (in excess)
* Fruit juice (in excess)
* Processed foods (e.g. frozen meals, packaged snacks)
* Fast food

**Mushrooms for Weight Loss**
* Anti-Obesity Effects of Medicinal and Edible Mushrooms: Some mushrooms have been shown to have anti-obesity effects, including reishi mushrooms.
* 18 best mushroom for weight loss in 2023 | Discover Magazine: Some mushrooms have been shown to have anti-obesity effects, including reishi mushrooms.
* Reishi Mushrooms Prevent Obesity in Mice: Reishi mushrooms have been shown to prevent obesity in mice.

**Psilocybin for Weight Loss**
* Psilocybin Treatment May Support Patients With Obesity: Psilocybin has been shown to have potential therapeutic benefits for obesity treatment.
* Complexities of psychedelics for therapeutic use in obesity: Psilocybin has been shown to have potential therapeutic benefits for obesity treatment.
* Psilocybin for Weight Loss: Psilocybin has been shown to have potential therapeutic benefits for weight loss.

Note: It's important to consult with a healthcare professional before making any significant changes to your diet or treatment plan.