Final answer:
Triglycerides are a type of lipid that can contain a mixture of fatty acids, including saturated fats and trans fats, but they are not categorized strictly as one type. They can contribute to health problems when present in high levels in the blood.
Step-by-step explanation:
Roxy's doctor informed her that she had tested high for triglycerides, which are a type of lipid in the blood. Triglycerides consist of three fatty acid chains attached to a glycerol backbone and can be categorized based on the presence of saturated or unsaturated fatty acids. They are not synonymous with saturated fats, simple sugars, cholesterol, or trans fats specifically, but can contain any of these types of fatty acids to varying degrees. In particular, saturated fats are triglycerides that do not have double bonds between carbon atoms and can lead to health issues such as atherosclerosis when consumed in high amounts. On the other hand, trans fats are a type of unsaturated fat with trans double bonds that can contribute to cardiovascular disease due to their effect on raising low-density lipoprotein (LDL, or 'bad' cholesterol) levels.