Final answer:
We primarily obtain lipids from dairy products and meats, which are sources of saturated fats, as well as from oils, nuts, and seeds, which provide unsaturated fats. For weight loss, vegetables are the most helpful due to their low calorie and high fiber content.
Step-by-step explanation:
The primary sources from which we obtain lipids (fats) are dairy products, such as meat, whole milk, butter, and cheese, which contain saturated fats. Additionally, plant sources like vegetable oils (soybeans, peanuts, sunflowers, etc.), nuts, and seeds are rich in unsaturated fats. Fats are essential for absorbing fat-soluble vitamins such as A, D, E, and K, and provide several health benefits when consumed in moderate amounts.
Regarding the weight loss question, consuming vegetables can help the most with weight loss since they are low in calories and high in fiber, which can be beneficial for weight management.